[X86][test] Add test cases using immediates to builtins-x86.c
[X86][test] Add test cases using immediates to builtins-x86.c

These builtins should work with immediate or variable shift operand for
gcc compatibility.

Differential Revision: https://reviews.llvm.org/D62850

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@362786 91177308-0d34-0410-b5e6-96231b3b80d8

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