Serialize source range info for TypeTraitExpr.

This caused some crazy crashes involving std::unordered_map being
deserialized from a PCH file and then template instantiation requiring
an explicit instantiation location; unfortunately I don't really know
how to come up with a minimal test case.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@197764 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Serialization/ASTReaderStmt.cpp

@@ -1499,7 +1499,10 @@ void ASTStmtReader::VisitTypeTraitExpr(TypeTraitExpr *E) {
   E->TypeTraitExprBits.NumArgs = Record[Idx++];
   E->TypeTraitExprBits.Kind = Record[Idx++];
   E->TypeTraitExprBits.Value = Record[Idx++];
-
+  SourceRange Range = ReadSourceRange(Record, Idx);
+  E->Loc = Range.getBegin();
+  E->RParenLoc = Range.getEnd();
+
   TypeSourceInfo **Args = E->getTypeSourceInfos();
   for (unsigned I = 0, N = E->getNumArgs(); I != N; ++I)
     Args[I] = GetTypeSourceInfo(Record, Idx);

lib/Serialization/ASTWriterStmt.cpp

@@ -1500,6 +1500,7 @@ void ASTStmtWriter::VisitTypeTraitExpr(TypeTraitExpr *E) {
   Record.push_back(E->TypeTraitExprBits.NumArgs);
   Record.push_back(E->TypeTraitExprBits.Kind); // FIXME: Stable encoding
   Record.push_back(E->TypeTraitExprBits.Value);
+  Writer.AddSourceRange(E->getSourceRange(), Record);
   for (unsigned I = 0, N = E->getNumArgs(); I != N; ++I)
     Writer.AddTypeSourceInfo(E->getArg(I), Record);
   Code = serialization::EXPR_TYPE_TRAIT;