[PECOFF] Ignore /debug option.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@191268 91177308-0d34-0410-b5e6-96231b3b80d8
[PECOFF] Ignore /pdb option.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@191269 91177308-0d34-0410-b5e6-96231b3b80d8
[PECOFF] Remove redundant comments.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@191270 91177308-0d34-0410-b5e6-96231b3b80d8
[PECOFF] Use macro for the repeating pattern of the Driver code.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@191271 91177308-0d34-0410-b5e6-96231b3b80d8