[CodeView] Add source languages ObjC and ObjC++

This patch adds llvm::codeview::SourceLanguage entries, DWARF translations, and PDB source file extensions in LLVM and allow LLDB's PDB parsers to recognize them correctly.

The CV_CFL_LANG enum in the Visual Studio 2022 documentation https://learn.microsoft.com/en-us/visualstudio/debugger/debug-interface-access/cv-cfl-lang defines:
```
    CV_CFL_OBJC     = 0x11,
    CV_CFL_OBJCXX   = 0x12,
```

Since the initial commit in D24317, ObjC was emitted as C language and ObjC++ as Masm.

Reviewed By: DavidSpickett

Differential Revision: https://reviews.llvm.org/D146221

1 files changed, 4 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
index fd4ea6e..86cdd11 100644
--- a/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
@@ -569,7 +569,6 @@ static SourceLanguage MapDWLangToCVLang(unsigned DWLang) {
   case dwarf::DW_LANG_C89:
   case dwarf::DW_LANG_C99:
   case dwarf::DW_LANG_C11:
-  case dwarf::DW_LANG_ObjC:
     return SourceLanguage::C;
   case dwarf::DW_LANG_C_plus_plus:
   case dwarf::DW_LANG_C_plus_plus_03:
@@ -595,6 +594,10 @@ static SourceLanguage MapDWLangToCVLang(unsigned DWLang) {
     return SourceLanguage::Swift;
   case dwarf::DW_LANG_Rust:
     return SourceLanguage::Rust;
+  case dwarf::DW_LANG_ObjC:
+    return SourceLanguage::ObjC;
+  case dwarf::DW_LANG_ObjC_plus_plus:
+    return SourceLanguage::ObjCpp;
   default:
     // There's no CodeView representation for this language, and CV doesn't
     // have an "unknown" option for the language field, so we'll use MASM,