X86: Consistently declare pass initializers in X86.h; NFC

This avoids declaring them twice: in X86TargetMachine.cpp and the file
implementing the pass.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@345801 91177308-0d34-0410-b5e6-96231b3b80d8
10 files changed