Revert "[Reassociate] Update test cases due to r222142."

This reverts commit r222144.  Commit r222142 is being reverted due to
a spec2006/gcc execution-time regression.

Update mips-varargs test as well.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@222397 91177308-0d34-0410-b5e6-96231b3b80d8