eliminate os_core, move into base; eliminate regs, move into arch abstraction layer, define x64 regs in x64 layer; move win32 backend for os core (now base) functionality to top-level win32 layer

src/arch/dwarf/arch_dwarf.c

@@ -0,0 +1,19 @@
+// Copyright (c) Epic Games Tools
+// Licensed under the MIT license (https://opensource.org/license/mit/)
+
+internal U8 *
+arch_dw_from_reg_code_table_from_arch(Arch arch)
+{
+  U8 *result = &arch_reg_code_u8_nil;
+  switch(arch)
+  {
+    default:{}break;
+#if defined(X64_H)
+    case Arch_x64:
+    {
+      result = dw_reg_code_from_x64_table;
+    }break;
+#endif
+  }
+  return result;
+}

src/arch/dwarf/arch_dwarf.h

@@ -0,0 +1,9 @@
+// Copyright (c) Epic Games Tools
+// Licensed under the MIT license (https://opensource.org/license/mit/)
+
+#ifndef ARCH_DWARF_H
+#define ARCH_DWARF_H
+
+internal U8 *arch_dw_from_reg_code_table_from_arch(Arch arch);
+
+#endif // ARCH_DWARF_H