Handle nested ObjC calls.

Properly handle annotation contexts while calculating extra information
for each token. This enable nested ObjC calls and thus solves (most of)
llvm.org/PR15164. E.g., we can now format:

[contentsContainer replaceSubview:[subviews objectAtIndex:0]
                             with:contentsNativeView];

Also fix a problem with the formatting of types in casts as this was
trivial now.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174498 91177308-0d34-0410-b5e6-96231b3b80d8
Adds a convenience function selectFirst to simplify matching.

A very common use case is to search for the first occurrence of
a certain node that is a descendant of another node. In that
case, selectFirst significantly simplifies the code at the client side.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174499 91177308-0d34-0410-b5e6-96231b3b80d8
Fix an issue with the formatting of stars in default values.

Before: void f(int *a = d *e, int b = 0);
After:  void f(int *a = d * e, int b = 0);

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174500 91177308-0d34-0410-b5e6-96231b3b80d8