[codeview] Use the correct max CV record length of 0xFF00

Previously we were splitting our records at 0xFFFF bytes, which the
Microsoft tools don't like.

Should fix failure on the new Windows self-host buildbot.

This length appears in microsoft-pdb/PDB/dbi/dbiimpl.h

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280522 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed