[X86] Add test case for PR30290s failing behaviour

Following the advice in review D45022, this currently tests for the broken llc
output where an instruction is mis-scheduled. This test is committed in advance
to improve the eventual fixing patch in D45022, making the bad behaviour that
that patch fixes clearer.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331514 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed