Resubmit "[CodeView] Hook CodeViewRecordIO for reading/writing symbols."

The original patch was broken due to some undefined behavior
as well as warnings that were triggering -Werror.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290000 91177308-0d34-0410-b5e6-96231b3b80d8
16 files changed