[clang] [CIR]Fix failing my_fmaxf test (PR #180956)

[Priyanshu Kumar via cfe-commits]

Priyanshu3820 wrote:

@erichkeane, now the test for my_fmax is failing and I am afraid how many more would fail one by one. So, I'll have to look at all the related tests

https://github.com/llvm/llvm-project/pull/180956