Mark some uninitialized memory as safe

Syscalls (but not C functions) are opaque to MemorySanitizer, thus some
memory addresses need to be manually marked as safe to access.

core/os/os2/file_linux.odin

@@ -269,6 +269,7 @@ _write_at :: proc(f: ^File_Impl, p: []byte, offset: i64) -> (nt: i64, err: Error
 	return
 }
 
+@(no_sanitize_memory)
 _file_size :: proc(f: ^File_Impl) -> (n: i64, err: Error) {
 	// TODO: Identify 0-sized "pseudo" files and return No_Size. This would
 	//       eliminate the need for the _read_entire_pseudo_file procs.

core/os/os_freebsd.odin

@@ -662,7 +662,7 @@ last_write_time_by_name :: proc(name: string) -> (File_Time, Error) {
 	return File_Time(modified), nil
 }
 
-@(private, require_results)
+@(private, require_results, no_sanitize_memory)
 _stat :: proc(path: string) -> (OS_Stat, Error) {
 	runtime.DEFAULT_TEMP_ALLOCATOR_TEMP_GUARD()
 	cstr := strings.clone_to_cstring(path, context.temp_allocator)
@@ -674,7 +674,7 @@ _stat :: proc(path: string) -> (OS_Stat, Error) {
 	return s, nil
 }
 
-@(private, require_results)
+@(private, require_results, no_sanitize_memory)
 _lstat :: proc(path: string) -> (OS_Stat, Error) {
 	runtime.DEFAULT_TEMP_ALLOCATOR_TEMP_GUARD()
 	cstr := strings.clone_to_cstring(path, context.temp_allocator)
@@ -688,7 +688,7 @@ _lstat :: proc(path: string) -> (OS_Stat, Error) {
 	return s, nil
 }
 
-@(private, require_results)
+@(private, require_results, no_sanitize_memory)
 _fstat :: proc(fd: Handle) -> (OS_Stat, Error) {
 	s: OS_Stat = ---
 	result := _unix_fstat(fd, &s)

core/os/os_haiku.odin

@@ -325,7 +325,7 @@ _alloc_command_line_arguments :: proc() -> []string {
 	return res
 }
 
-@(private, require_results)
+@(private, require_results, no_sanitize_memory)
 _stat :: proc(path: string) -> (OS_Stat, Error) {
 	runtime.DEFAULT_TEMP_ALLOCATOR_TEMP_GUARD()
 	cstr := strings.clone_to_cstring(path, context.temp_allocator)
@@ -339,7 +339,7 @@ _stat :: proc(path: string) -> (OS_Stat, Error) {
 	return s, nil
 }
 
-@(private, require_results)
+@(private, require_results, no_sanitize_memory)
 _lstat :: proc(path: string) -> (OS_Stat, Error) {
 	runtime.DEFAULT_TEMP_ALLOCATOR_TEMP_GUARD()
 	cstr := strings.clone_to_cstring(path, context.temp_allocator)
@@ -353,7 +353,7 @@ _lstat :: proc(path: string) -> (OS_Stat, Error) {
 	return s, nil
 }
 
-@(private, require_results)
+@(private, require_results, no_sanitize_memory)
 _fstat :: proc(fd: Handle) -> (OS_Stat, Error) {
 	// deliberately uninitialized
 	s: OS_Stat = ---

core/os/os_linux.odin

@@ -674,7 +674,7 @@ seek :: proc(fd: Handle, offset: i64, whence: int) -> (i64, Error) {
 	return i64(res), nil
 }
 
-@(require_results)
+@(require_results, no_sanitize_memory)
 file_size :: proc(fd: Handle) -> (i64, Error) {
 	// deliberately uninitialized; the syscall fills this buffer for us
 	s: OS_Stat = ---
@@ -794,7 +794,7 @@ last_write_time_by_name :: proc(name: string) -> (time: File_Time, err: Error) {
 	return File_Time(modified), nil
 }
 
-@(private, require_results)
+@(private, require_results, no_sanitize_memory)
 _stat :: proc(path: string) -> (OS_Stat, Error) {
 	runtime.DEFAULT_TEMP_ALLOCATOR_TEMP_GUARD()
 	cstr := strings.clone_to_cstring(path, context.temp_allocator)
@@ -808,7 +808,7 @@ _stat :: proc(path: string) -> (OS_Stat, Error) {
 	return s, nil
 }
 
-@(private, require_results)
+@(private, require_results, no_sanitize_memory)
 _lstat :: proc(path: string) -> (OS_Stat, Error) {
 	runtime.DEFAULT_TEMP_ALLOCATOR_TEMP_GUARD()
 	cstr := strings.clone_to_cstring(path, context.temp_allocator)
@@ -822,7 +822,7 @@ _lstat :: proc(path: string) -> (OS_Stat, Error) {
 	return s, nil
 }
 
-@(private, require_results)
+@(private, require_results, no_sanitize_memory)
 _fstat :: proc(fd: Handle) -> (OS_Stat, Error) {
 	// deliberately uninitialized; the syscall fills this buffer for us
 	s: OS_Stat = ---

core/os/os_netbsd.odin

@@ -724,7 +724,7 @@ last_write_time_by_name :: proc(name: string) -> (time: File_Time, err: Error) {
 	return File_Time(modified), nil
 }
 
-@(private, require_results)
+@(private, require_results, no_sanitize_memory)
 _stat :: proc(path: string) -> (OS_Stat, Error) {
 	runtime.DEFAULT_TEMP_ALLOCATOR_TEMP_GUARD()
 	cstr := strings.clone_to_cstring(path, context.temp_allocator)
@@ -736,7 +736,7 @@ _stat :: proc(path: string) -> (OS_Stat, Error) {
 	return s, nil
 }
 
-@(private, require_results)
+@(private, require_results, no_sanitize_memory)
 _lstat :: proc(path: string) -> (OS_Stat, Error) {
 	runtime.DEFAULT_TEMP_ALLOCATOR_TEMP_GUARD()
 	cstr := strings.clone_to_cstring(path, context.temp_allocator)
@@ -750,7 +750,7 @@ _lstat :: proc(path: string) -> (OS_Stat, Error) {
 	return s, nil
 }
 
-@(private, require_results)
+@(private, require_results, no_sanitize_memory)
 _fstat :: proc(fd: Handle) -> (OS_Stat, Error) {
 	s: OS_Stat = ---
 	result := _unix_fstat(fd, &s)

core/os/os_openbsd.odin

@@ -639,7 +639,7 @@ last_write_time_by_name :: proc(name: string) -> (time: File_Time, err: Error) {
 	return File_Time(modified), nil
 }
 
-@(private, require_results)
+@(private, require_results, no_sanitize_memory)
 _stat :: proc(path: string) -> (OS_Stat, Error) {
 	runtime.DEFAULT_TEMP_ALLOCATOR_TEMP_GUARD()
 	cstr := strings.clone_to_cstring(path, context.temp_allocator)
@@ -653,7 +653,7 @@ _stat :: proc(path: string) -> (OS_Stat, Error) {
 	return s, nil
 }
 
-@(private, require_results)
+@(private, require_results, no_sanitize_memory)
 _lstat :: proc(path: string) -> (OS_Stat, Error) {
 	runtime.DEFAULT_TEMP_ALLOCATOR_TEMP_GUARD()
 	cstr := strings.clone_to_cstring(path, context.temp_allocator)
@@ -667,7 +667,7 @@ _lstat :: proc(path: string) -> (OS_Stat, Error) {
 	return s, nil
 }
 
-@(private, require_results)
+@(private, require_results, no_sanitize_memory)
 _fstat :: proc(fd: Handle) -> (OS_Stat, Error) {
 	// deliberately uninitialized
 	s: OS_Stat = ---