[X86][inline asm] support even directive 

The .even directive aligns content to an evan-numbered address.

In at&t syntax .even 
In Microsoft syntax even (without the dot).

Differential Revision: http://reviews.llvm.org/D15413



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255462 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed