[FastISel][x86] Add testcase for r210719.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210746 91177308-0d34-0410-b5e6-96231b3b80d8
Avoid redundant allocations in the linker optimisation hint

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210747 91177308-0d34-0410-b5e6-96231b3b80d8
Avoid anonymous namespace in header from r210747

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210748 91177308-0d34-0410-b5e6-96231b3b80d8
Avoid in-class initializer from r210747

Turns out MSVC doesn't like this. Sorry for the noise!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210749 91177308-0d34-0410-b5e6-96231b3b80d8