[PECOFF] Simplicy object allocation code. No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@187214 91177308-0d34-0410-b5e6-96231b3b80d8
Make local variables to start with a lowercase character for consistency with the LLD coding style.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@187215 91177308-0d34-0410-b5e6-96231b3b80d8