[MC] fix a clang-tidy warning, NFC

Summary:
Per clang-tidy:
function 'llvm::MCStreamer::checkCVLocSection' has a definition with different parameter names

.../llvm/lib/MC/MCStreamer.cpp:275:18: the definition seen here

.../llvm/include/llvm/MC/MCStreamer.h:235:8: differing parameters are named here: ('FuncId'), in definition: ('FunctionId')

Reviewers: bkramer

Reviewed By: bkramer

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D51406

llvm-svn: 340912