[PATCH] Add ObjCBoxable handling to ObjCMigrator

[AlexDenisov via cfe-commits]

Extend ObjCMigrator to cover automatic migration from message sending to boxable literals, e.g.:

```before
typedef struct __attribute__((objc_boxable)) CGRect CGRect;
/// ...
CGRect rect;
[NSValue valueWithBytes:&rect objCType:@encode(CGRect)];
[NSValue valueWithCGPoint:functionReturningCGPoint()];
```

```after
typedef struct __attribute__((objc_boxable)) CGRect CGRect;
/// ...
CGRect rect;
@(rect);
@(functionReturningCGPoint());
```

I will appreciate any ideas how to improve it since the implementation is far from beautiful.

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--
AlexDenisov
Software Engineer, http://lowlevelbits.org

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