[asan] Generate asm instrumentation in MC.

Generate entire ASan asm instrumentation in MC without
relying on runtime helper functions.

Patch by Yuri Gorshenin.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212455 91177308-0d34-0410-b5e6-96231b3b80d8
X86: revert unintentional change to X86FastISel.

This crept in with r212443.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212459 91177308-0d34-0410-b5e6-96231b3b80d8
Make helper functions static.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212460 91177308-0d34-0410-b5e6-96231b3b80d8