Improve location fidelity of objc decls.

-Add the location of the class name to all objc container decls, not just ObjCInterfaceDecl.
-Make objc decls consistent with the rest of the NamedDecls and have getLocation() point to the
 class name, not the location of '@'.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@141061 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/DeclObjC.cpp b/lib/AST/DeclObjC.cpp
index d7775d5..48fbbe0 100644
--- a/lib/AST/DeclObjC.cpp
+++ b/lib/AST/DeclObjC.cpp
@@ -603,11 +603,10 @@
 ObjCInterfaceDecl::
 ObjCInterfaceDecl(DeclContext *DC, SourceLocation atLoc, IdentifierInfo *Id,
                   SourceLocation CLoc, bool FD, bool isInternal)
-  : ObjCContainerDecl(ObjCInterface, DC, atLoc, Id),
+  : ObjCContainerDecl(ObjCInterface, DC, Id, CLoc, atLoc),
     TypeForDecl(0), SuperClass(0),
     CategoryList(0), IvarList(0), 
-    ForwardDecl(FD), InternalInterface(isInternal), ExternallyCompleted(false),
-    ClassLoc(CLoc) {
+    ForwardDecl(FD), InternalInterface(isInternal), ExternallyCompleted(false) {
 }
 
 void ObjCInterfaceDecl::LoadExternalDefinition() const {
@@ -847,9 +846,10 @@
 //===----------------------------------------------------------------------===//
 
 ObjCProtocolDecl *ObjCProtocolDecl::Create(ASTContext &C, DeclContext *DC,
-                                           SourceLocation L,
-                                           IdentifierInfo *Id) {
-  return new (C) ObjCProtocolDecl(DC, L, Id);
+                                           IdentifierInfo *Id,
+                                           SourceLocation nameLoc,
+                                           SourceLocation atStartLoc) {
+  return new (C) ObjCProtocolDecl(DC, Id, nameLoc, atStartLoc);
 }
 
 ObjCProtocolDecl *ObjCProtocolDecl::lookupProtocolNamed(IdentifierInfo *Name) {
@@ -979,9 +979,12 @@
 
 ObjCCategoryImplDecl *
 ObjCCategoryImplDecl::Create(ASTContext &C, DeclContext *DC,
-                             SourceLocation L,IdentifierInfo *Id,
-                             ObjCInterfaceDecl *ClassInterface) {
-  return new (C) ObjCCategoryImplDecl(DC, L, Id, ClassInterface);
+                             IdentifierInfo *Id,
+                             ObjCInterfaceDecl *ClassInterface,
+                             SourceLocation nameLoc,
+                             SourceLocation atStartLoc) {
+  return new (C) ObjCCategoryImplDecl(DC, Id, ClassInterface,
+                                      nameLoc, atStartLoc);
 }
 
 ObjCCategoryDecl *ObjCCategoryImplDecl::getCategoryDecl() const {
@@ -1056,10 +1059,12 @@
 
 ObjCImplementationDecl *
 ObjCImplementationDecl::Create(ASTContext &C, DeclContext *DC,
-                               SourceLocation L,
                                ObjCInterfaceDecl *ClassInterface,
-                               ObjCInterfaceDecl *SuperDecl) {
-  return new (C) ObjCImplementationDecl(DC, L, ClassInterface, SuperDecl);
+                               ObjCInterfaceDecl *SuperDecl,
+                               SourceLocation nameLoc,
+                               SourceLocation atStartLoc) {
+  return new (C) ObjCImplementationDecl(DC, ClassInterface, SuperDecl,
+                                        nameLoc, atStartLoc);
 }
 
 void ObjCImplementationDecl::setIvarInitializers(ASTContext &C,