Use Clang for D language support until there is a proper language plugin for it.

[johanengelen]

Summary

Binaries with Dwarf language set to "DW_LANG_D" currently do not show much information in LLDB (e.g. no local variables).

With this simple change, Clang language support is used for D (the same as what is done for Rust) and local variables show up nicely.

I don't know whether, or how, to add a testcase for this. Please advise.

(I don't have write access, so if you accept the change, please apply it too. Thanks!)

source/Symbol/ClangASTContext.cpp

 ClangASTContextSupportsLanguage(lldb::LanguageType language) {
   return language == eLanguageTypeUnknown || // Clang is the default type system
          Language::LanguageIsC(language) ||
          Language::LanguageIsCPlusPlus(language) ||
          Language::LanguageIsObjC(language) ||
          Language::LanguageIsPascal(language) ||
          // Use Clang for Rust until there is a proper language plugin for it
          language == eLanguageTypeRust ||
-         language == eLanguageTypeExtRenderScript;
+         language == eLanguageTypeExtRenderScript ||
+         // Use Clang for D until there is a proper language plugin for it
+         language == eLanguageTypeD;
 }
 }
 
 typedef lldb_private::ThreadSafeDenseMap<clang::ASTContext *, ClangASTContext *>
     ClangASTMap;
 
 static ClangASTMap &GetASTMap() {
   static ClangASTMap *g_map_ptr = nullptr;