[X86][IR] Move the autoupgrading of store intrinsics out of the main nested if/else chain. This should buy a little more time against the MSVC limit mentioned in PR31034.

The handlers for stores all return at the end of their block so they can be picked off early.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289339 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed