Add Builtins.def attribute for "can be a constant expression".
 - Enabled for builtins which are always constant expressions
   (__builtin_huge_val*, __builtin_inf*, __builtin_constant_p,
   __builtin_classify_type, __builtin___CFStringMakeConstantString).

Added Builtin::Context::isConstantExpr.
 - Currently overly simply interface which only works for builtins
   whose constantexprness does not depend on their arguments.

CallExpr::isBuiltinConstantExpr now takes an ASTContext argument.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@56983 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 9c5c4f2..8214fe4 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -878,7 +878,7 @@
     return false;
   case Expr::CallExprClass: {
     const CallExpr *CE = cast<CallExpr>(Init);
-    if (CE->isBuiltinConstantExpr())
+    if (CE->isBuiltinConstantExpr(Context))
       return false;
     Diag(Init->getExprLoc(),
          diag::err_init_element_not_constant, Init->getSourceRange());
@@ -1077,7 +1077,7 @@
     return false;
   case Expr::CallExprClass: {
     const CallExpr *CE = cast<CallExpr>(Init);
-    if (CE->isBuiltinConstantExpr())
+    if (CE->isBuiltinConstantExpr(Context))
       return false;
     Diag(Init->getExprLoc(),
          diag::err_init_element_not_constant, Init->getSourceRange());