[codeview] Look through typedefs in getCompleteTypeIndex

Summary:
Any time a symbol record, whether it's S_UDT, S_LOCAL, or S_[GL]DATA32,
references a record type, it should use the complete type index, even if
there's a typedef in the way.

Fixes the compiler part of PR39853.

Reviewers: zturner, aganea

Subscribers: hiraditya, arphaman, llvm-commits

Differential Revision: https://reviews.llvm.org/D55236

llvm-svn: 348902