[C++11] Replacing Scope iterators decl_begin() and decl_end() with iterator_range decls(). Updating all of the usages of the iterators with range-based for loops, and removing the no-longer-needed iterator versions.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204052 91177308-0d34-0410-b5e6-96231b3b80d8
[C++11] Replacing Scope iterators using_directives_begin() and using_directives_end() with iterator_range using_directives(). Updating all of the usages of the iterators with range-based for loops, and removing the no-longer-needed iterator versions.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204053 91177308-0d34-0410-b5e6-96231b3b80d8
[C++11] Replacing DeclContext iterators using_directives_begin() and using_directives_end() with iterator_range using_directives(). Updating all of the usages of the iterators with range-based for loops, and removing the no-longer-needed iterator versions. Also used as an opportunity to normalize the name from getUsingDirectives() to using_directives().

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204061 91177308-0d34-0410-b5e6-96231b3b80d8
[C++11] Replacing CallArgList writeback iterators with iterator_range writebacks(). Updating all of the usages of the iterators with range-based for loops, and removing the no-longer-needed iterator versions.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204062 91177308-0d34-0410-b5e6-96231b3b80d8
Objective-C. Do not warn when an instance method and
class method with the same selctor but different argument 
types having one of them in class extension.
// rdar://16312105


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204065 91177308-0d34-0410-b5e6-96231b3b80d8