Enhance attribute 'nonnull' to be applicable to parameters directly (infix).

This allows the following syntax:

  void baz(__attribute__((nonnull)) const char *str);

instead of:

  void baz(const char *str) __attribute__((nonnull(1)));

This also extends to Objective-C methods.

The checking logic in Sema is not as clean as I would like.  Effectively
now we need to check both the FunctionDecl/ObjCMethodDecl and the parameters,
so the point of truth is spread in two places, but the logic isn't that
cumbersome.

Implements <rdar://problem/14691443>.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@199467 91177308-0d34-0410-b5e6-96231b3b80d8

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