translate-c: set up debug scope for translated functions

Author: andrewrk

src/codegen.cpp

@@ -590,8 +590,10 @@ static ZigLLVMDIScope *get_di_scope(CodeGen *g, Scope *scope) {
             bool is_optimized = g->build_mode != BuildModeDebug;
             bool is_internal_linkage = (fn_table_entry->body_node != nullptr &&
                     fn_table_entry->export_list.length == 0);
+            ZigLLVMDIScope *fn_di_scope = get_di_scope(g, scope->parent);
+            assert(fn_di_scope != nullptr);
             ZigLLVMDISubprogram *subprogram = ZigLLVMCreateFunction(g->dbuilder,
-                get_di_scope(g, scope->parent), buf_ptr(&fn_table_entry->symbol_name), "",
+                fn_di_scope, buf_ptr(&fn_table_entry->symbol_name), "",
                 import->di_file, line_number,
                 fn_table_entry->type_entry->di_type, is_internal_linkage,
                 is_definition, scope_line, flags, is_optimized, nullptr);

src/ir.cpp

@@ -14051,6 +14051,8 @@ static TypeTableEntry *ir_analyze_instruction_c_import(IrAnalyze *ira, IrInstruc
     child_import->package = new_anonymous_package();
     child_import->package->package_table.put(buf_create_from_str("builtin"), ira->codegen->compile_var_package);
     child_import->package->package_table.put(buf_create_from_str("std"), ira->codegen->std_package);
+    child_import->di_file = ZigLLVMCreateFile(ira->codegen->dbuilder,
+        buf_ptr(buf_create_from_str("cimport.h")), buf_ptr(buf_create_from_str(".")));
 
     ZigList<ErrorMsg *> errors = {0};