[RegAlloc]  Simplify MIR test

Remove the IR part from test/CodeGen/X86/regalloc-copy-hints.mir (added by
r355854).

To make the test remain functional, the parts of the MBB names referring to
BB names have been removed, as well as all machine memory operands.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@356899 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed