[LangRef] Clarify which fast-math flags affect fcmp.

nsz has no effect due to the way fcmp is defined; +0 and -0 compare
equal anyway. reassoc could have the obvious effect.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337322 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed