[X86] Improve the rotate ISel test

Summary:
- Added 64-bit target testing.
- Added 64-bit operand test cases.
- Added cases that demonstrate pr30644

Reviewers: RKSimon, craig.topper, igorb

Differential Revision: https://reviews.llvm.org/D25401

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@283695 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed