Changes

Summary

llvm-dwarfdump: Pretty print names qualified/with scopes (details)
llvm-dwarfdump: Don't print even an empty string when a type is unprintable (details)
llvm-dwarfdump: support for type printing "decltype(nullptr)" as "nullptr_t" (details)
llvm-dwarfdump: pretty type printing: print fully qualified names in function type parameter types (details)

Commit 5bfe5207ef283194a76616e5693a67a14c158ae3 by dblaikie llvm-dwarfdump: Pretty print names qualified/with scopes
	llvm/test/tools/llvm-dwarfdump/X86/prettyprint_types.s
	llvm/test/DebugInfo/X86/addr-tu-to-non-tu.ll
	llvm/lib/DebugInfo/DWARF/DWARFDie.cpp
Commit 11e0b79b056a5f1ba1feb81872aee67709f34834 by dblaikie llvm-dwarfdump: Don't print even an empty string when a type is unprintable
	llvm/lib/DebugInfo/DWARF/DWARFDie.cpp
	llvm/test/tools/llvm-dwarfdump/X86/verify_debug_info.s
Commit 606ea0dd2a7308d4af222ddcf0ae66c6267cb90d by dblaikie llvm-dwarfdump: support for type printing "decltype(nullptr)" as "nullptr_t" This should probably be rendered as "std::nullptr_t" but for now clang uses the unqualified name (which is ambiguous with possible user defined name in the global namespace), so match that here.
	llvm/test/tools/llvm-dwarfdump/X86/prettyprint_types.s
	llvm/lib/DebugInfo/DWARF/DWARFDie.cpp
Commit cb42bb355061235f1c4190c8a35e59e4cfb15163 by dblaikie llvm-dwarfdump: pretty type printing: print fully qualified names in function type parameter types
	llvm/lib/DebugInfo/DWARF/DWARFDie.cpp
	llvm/test/tools/llvm-dwarfdump/X86/prettyprint_types.s