Implement __builtin_LINE() et. al. to support source location capture.

Summary:
This patch implements the source location builtins `__builtin_LINE(), `__builtin_FUNCTION()`, `__builtin_FILE()` and `__builtin_COLUMN()`. These builtins are needed to implement [`std::experimental::source_location`](https://rawgit.com/cplusplus/fundamentals-ts/v2/main.html#reflection.src_loc.creation).

With the exception of `__builtin_COLUMN`, GCC also implements these builtins, and Clangs behavior is intended to match as closely as possible. 

Reviewers: rsmith, joerg, aaron.ballman, bogner, majnemer, shafik, martong

Reviewed By: rsmith

Subscribers: rnkovacs, loskutov, riccibruno, mgorny, kunitoki, alexr, majnemer, hfinkel, cfe-commits

Differential Revision: https://reviews.llvm.org/D37035

llvm-svn: 360937

1 files changed, 3 insertions, 3 deletions

diff --git a/clang/lib/Sema/SemaDeclCXX.cpp b/clang/lib/Sema/SemaDeclCXX.cpp
index 1da2ca8ca5f..99dd96c39da 100644
--- a/clang/lib/Sema/SemaDeclCXX.cpp
+++ b/clang/lib/Sema/SemaDeclCXX.cpp
@@ -62,7 +62,7 @@ namespace {
 
   public:
     CheckDefaultArgumentVisitor(Expr *defarg, Sema *s)
-      : DefaultArg(defarg), S(s) {}
+        : DefaultArg(defarg), S(s) {}
 
     bool VisitExpr(Expr *Node);
     bool VisitDeclRefExpr(DeclRefExpr *DRE);
@@ -13025,7 +13025,7 @@ ExprResult Sema::BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field) {
 
   // If we already have the in-class initializer nothing needs to be done.
   if (Field->getInClassInitializer())
-    return CXXDefaultInitExpr::Create(Context, Loc, Field);
+    return CXXDefaultInitExpr::Create(Context, Loc, Field, CurContext);
 
   // If we might have already tried and failed to instantiate, don't try again.
   if (Field->isInvalidDecl())
@@ -13066,7 +13066,7 @@ ExprResult Sema::BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field) {
       Field->setInvalidDecl();
       return ExprError();
     }
-    return CXXDefaultInitExpr::Create(Context, Loc, Field);
+    return CXXDefaultInitExpr::Create(Context, Loc, Field, CurContext);
   }
 
   // DR1351: