We have in place support for parsing #pragma FENV_ACCESS, but that

We have in place support for parsing #pragma FENV_ACCESS, but that
information is then discarded with a warning to the user that we don't
support it.

This patch gets us one step closer by getting the info down into the
AST in most cases.

Reviewed by:	rsmith
Differential Revision:	https://reviews.llvm.org/D49865

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@339693 91177308-0d34-0410-b5e6-96231b3b80d8