Allow getting all source locations of selector identifiers in a ObjCMessageExpr.

Instead of always storing all source locations for the selector identifiers
we check whether all the identifiers are in a "standard" position; "standard" position is

  -Immediately before the arguments: [foo first:1 second:2]
  -With a space between the arguments: [foo first: 1 second: 2]
  -For nullary selectors, immediately before ']': [foo release]

In such cases we infer the locations instead of storing them.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@140987 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Serialization/ASTReaderStmt.cpp b/lib/Serialization/ASTReaderStmt.cpp
index 0571c10..e2a78e9 100644
--- a/lib/Serialization/ASTReaderStmt.cpp
+++ b/lib/Serialization/ASTReaderStmt.cpp
@@ -841,6 +841,8 @@
   VisitExpr(E);
   assert(Record[Idx] == E->getNumArgs());
   ++Idx;
+  unsigned NumStoredSelLocs = Record[Idx++];
+  E->SelLocsKind = Record[Idx++]; 
   E->setDelegateInitCall(Record[Idx++]);
   ObjCMessageExpr::ReceiverKind Kind
     = static_cast<ObjCMessageExpr::ReceiverKind>(Record[Idx++]);
@@ -871,10 +873,13 @@
 
   E->LBracLoc = ReadSourceLocation(Record, Idx);
   E->RBracLoc = ReadSourceLocation(Record, Idx);
-  E->SelectorLoc = ReadSourceLocation(Record, Idx);
 
   for (unsigned I = 0, N = E->getNumArgs(); I != N; ++I)
     E->setArg(I, Reader.ReadSubExpr());
+
+  SourceLocation *Locs = E->getStoredSelLocs();
+  for (unsigned I = 0; I != NumStoredSelLocs; ++I)
+    Locs[I] = ReadSourceLocation(Record, Idx);
 }
 
 void ASTStmtReader::VisitObjCForCollectionStmt(ObjCForCollectionStmt *S) {
@@ -1747,7 +1752,8 @@
       break;
     case EXPR_OBJC_MESSAGE_EXPR:
       S = ObjCMessageExpr::CreateEmpty(Context,
-                                     Record[ASTStmtReader::NumExprFields]);
+                                     Record[ASTStmtReader::NumExprFields],
+                                     Record[ASTStmtReader::NumExprFields + 1]);
       break;
     case EXPR_OBJC_ISA:
       S = new (Context) ObjCIsaExpr(Empty);