[NFC] Fixed typo in tests parameters

Summary:
llc reports `fp32-denormals` is not recognized. I guess it was intended to be
`-denormal-fp-math-f32={preserve-sign|ieee} -mattr=+mad-mac-f32-insts`

Reviewers: rampitec

Reviewed By: rampitec

Subscribers: jvesely, nhaehnle, llvm-commits, kerbowa

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D83883