Allow speculating llvm.sqrt, fma and fmuladd

This doesn't set errno, so this should be OK.
Also update the documentation to explicitly state
that errno are not set.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200501 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed