[llvm] ValueTracking: Identify implied fp classes by general fcmp (PR #66505)

[via llvm-commits]

ronlieb wrote:

build of libdevice running into issue 

[ 67%] Generating acosD.bc

 Assertion `(RHSClass == fcPosNormal || RHSClass == fcNegNormal || RHSClass == fcPosSubnormal || RHSClass == fcNegSubnormal) && "should have been recognized as an exact class test"' failed.



https://github.com/llvm/llvm-project/pull/66505