[X86][SSE] Add test cases for PR29078

'Failure to recognise i64 sitofp/uitofp conversions that can be performed as i32'

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280671 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed