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Objective-C++11: Support static_assert() in @interface/@implementation ivar…

Description

Objective-C++11: Support static_assert() in @interface/@implementation ivar lists and method declarations

This adds support for static_assert() (and _Static_assert()) in
@interface/@implementation ivar lists and in @interface method declarations.

It was already supported in @implementation blocks outside of the ivar lists.

The assert AST nodes are added at file scope, matching where other
(non-Objective-C) declarations at @interface / @implementation level go (cf
allTUVariables).

Also add a __has_feature(objc_c_static_assert) that's true in C11 (and
__has_extension(objc_c_static_assert) that's always true) and
__has_feature(objc_cxx_static_assert) that's true in C++11 modea fter this
patch, so it's possible to check if this is supported.

Differential Revision: https://reviews.llvm.org/D59223