GlobalISel: Enforce operand types for constants

GlobalISel: Enforce operand types for constants

A number of of tests were using imm operands, not cimm. Since CSE
relies on the exact ConstantInt* pointer used, and implicit
conversions are generally evil, also enforce the bitsize of the types.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353113 91177308-0d34-0410-b5e6-96231b3b80d8