Reland Implement _ExtInt as an extended int type specifier.
I fixed the LLDB issue, so re-applying the patch.
This reverts commit a4b88c044980337bb14390be654fe76864aa60ec.
diff --git a/clang/lib/CodeGen/CGDebugInfo.h b/clang/lib/CodeGen/CGDebugInfo.h
index 4915e19..34164fb 100644
--- a/clang/lib/CodeGen/CGDebugInfo.h
+++ b/clang/lib/CodeGen/CGDebugInfo.h
@@ -168,6 +168,7 @@
llvm::DIType *CreateType(const BuiltinType *Ty);
llvm::DIType *CreateType(const ComplexType *Ty);
llvm::DIType *CreateType(const AutoType *Ty);
+ llvm::DIType *CreateType(const ExtIntType *Ty);
llvm::DIType *CreateQualifiedType(QualType Ty, llvm::DIFile *Fg);
llvm::DIType *CreateType(const TypedefType *Ty, llvm::DIFile *Fg);
llvm::DIType *CreateType(const TemplateSpecializationType *Ty,