Propagate the ASTContext to various AST traversal and lookup functions.
No functionality change (really).

llvm-svn: 68726
diff --git a/clang/lib/Analysis/CheckObjCInstMethSignature.cpp b/clang/lib/Analysis/CheckObjCInstMethSignature.cpp
index a59ed88..97e77cc 100644
--- a/clang/lib/Analysis/CheckObjCInstMethSignature.cpp
+++ b/clang/lib/Analysis/CheckObjCInstMethSignature.cpp
@@ -97,8 +97,8 @@
   ASTContext& Ctx = BR.getContext();
   
   while (C && NumMethods) {
-    for (ObjCInterfaceDecl::instmeth_iterator I=C->instmeth_begin(),
-         E=C->instmeth_end(); I!=E; ++I) {
+    for (ObjCInterfaceDecl::instmeth_iterator I=C->instmeth_begin(Ctx),
+         E=C->instmeth_end(Ctx); I!=E; ++I) {
 
       ObjCMethodDecl* M = *I;
       Selector S = M->getSelector();