[codeview] Emit 'D' as the cv source language for D code

This matches DMD:
https://github.com/dlang/dmd/blob/522263965cf3a27ed16b31f3c3562db86cdeabec/src/ddmd/backend/cv8.c#L199

Fixes PR33899.

llvm-svn: 308890
diff --git a/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
index ec0f007..c9686cc 100644
--- a/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
@@ -570,6 +570,8 @@
     return SourceLanguage::Cobol;
   case dwarf::DW_LANG_Java:
     return SourceLanguage::Java;
+  case dwarf::DW_LANG_D:
+    return SourceLanguage::D;
   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,