[ARM] Fix test CodeGen/ARM/fpcmp_ueq.ll broken by rL290616

Commit rL290616 (https://reviews.llvm.org/rL290616) changed a checking command
for the triple arm-apple-darwin in LLVM::CodeGen/ARM/fpcmp_ueq.ll. As a result
of the changes the test could fail for the valid generated code.

These changes fixes the test to check only instructions we would expect.

Differential Revision: https://reviews.llvm.org/D28159

llvm-svn: 291678