[llvm] Revert "ValueTracking: Improve handling of fadd in computeKnownFPClass." (PR #174290)

[Matt Arsenault via llvm-commits]

arsenm wrote:

But also what this test is doing is illegal. You can't simply flip the control mode mid-non-strictfp function. This should be compiling these functions with the correct denormal-fp-math flag/attribute 

https://github.com/llvm/llvm-project/pull/174290