Move support for "#pragma STDC FP_CONTRACT" to Parser; add Sema actions

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@125474 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaAttr.cpp b/lib/Sema/SemaAttr.cpp
index c983199..794b0b1 100644
--- a/lib/Sema/SemaAttr.cpp
+++ b/lib/Sema/SemaAttr.cpp
@@ -350,6 +350,20 @@
   }
 }
 
+void Sema::ActOnPragmaFPContract(tok::OnOffSwitch OOS) {
+  switch (OOS) {
+  case tok::OOS_ON:
+    FPFeatures.fp_contract = 1;
+    break;
+  case tok::OOS_OFF:
+    FPFeatures.fp_contract = 0; 
+    break;
+  case tok::OOS_DEFAULT:
+    FPFeatures.fp_contract = getLangOptions().DefaultFPContract;
+    break;
+  }
+}
+
 void Sema::PushNamespaceVisibilityAttr(const VisibilityAttr *Attr) {
   // Visibility calculations will consider the namespace's visibility.
   // Here we just want to note that we're in a visibility context