[X86] Fix description for pass X86FixupSetCC.cpp, NFCI

It should be a typo when the author created this file from
X86OptimizeLEAs.cpp.

llvm/lib/Target/X86/X86FixupSetCC.cpp

@@ -1,4 +1,4 @@
-//===---- X86FixupSetCC.cpp - optimize usage of LEA instructions ----------===//
+//===- X86FixupSetCC.cpp - fix zero-extension of setcc patterns -----------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.