Update LLVM backend to begin work on a generic ABI system

src/llvm_backend.hpp

@@ -74,6 +74,7 @@ struct lbModule {
 	gbMutex mutex;
 
 	Map<LLVMTypeRef> types; // Key: Type *
+	i32 internal_type_level;
 
 	Map<lbValue>  values;           // Key: Entity *
 	StringMap<lbValue>  members;
@@ -83,6 +84,7 @@ struct lbModule {
 	StringMap<LLVMValueRef> const_strings;
 
 	Map<lbProcedure *> anonymous_proc_lits; // Key: Ast *
+	Map<struct lbFunctionType *> function_type_map; // Key: Type *
 
 	u32 global_array_index;
 	u32 global_generated_index;
@@ -199,6 +201,7 @@ struct lbProcedure {
 	bool         is_entry_point;
 	bool         is_startup;
 
+	lbFunctionType *abi_function_type;
 
 	LLVMValueRef    value;
 	LLVMBuilderRef  builder;