Change Details

Tested with stage 2 -DCMAKE_BUILD_TYPE=Debug clang, .debug_info is smaller by 11 bytes. One of the difference: DW_AT_decl_line for the Clang synthesized `__va_list_tag` (`CreateX86_64ABIBuiltinVaListDecl`) is now dropped. Depends on D94391

For Clang synthesized `__va_list_tag` (`CreateX86_64ABIBuiltinVaListDecl`), its DW_AT_decl_file/DW_AT_decl_line are arbitrarily set from `CurLoc`. Drop that. In a stage 2 `-DCMAKE_BUILD_TYPE=Debug` clang build, I observe that in driver.cpp, DW_AT_decl_file/DW_AT_decl_line may be set to an `#include` line (the transitively included file uses va_arg (`__builtin_va_arg`)). This seems arbitrary. Depends on D94391

Tested with stage 2 -DCMAKE_BUILD_TYPE=Debug clang, .debug_info is smaller by 11 bytes.For Clang synthesized `__va_list_tag` (`CreateX86_64ABIBuiltinVaListDecl`), One of the difference: DW_AT_decl_line for the Clang synthesized `__va_list_tag` (`CreateX86_64ABIBuiltinVaListDecl`) is now droppedits DW_AT_decl_file/DW_AT_decl_line are arbitrarily set from `CurLoc`. Drop that. In a stage 2 `-DCMAKE_BUILD_TYPE=Debug` clang build, I observe that in driver.cpp, DW_AT_decl_file/DW_AT_decl_line may be set to an `#include` line (the transitively included file uses va_arg (`__builtin_va_arg`)). This seems arbitrary. Depends on D94391