[X86] Remove \brief in FixupBW. NFC.
[X86] Remove \brief in FixupBW. NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268754 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit a2a67a17320547435affc8d30bf7eafc57d543e8)

Cherry-picker's note: This pass is disabled by default.
rdar://25897676

apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm