Andy Gibbs 50b6ceff1f Consolidate and improve the handling of built-in feature-like macros ...

Summary:
The parsing logic has been separated out from the macro implementation logic, leading to a number of improvements:

* Gracefully handle unexpected/invalid tokens, too few, too many and nested parameters
* Provide consistent behaviour between all built-in feature-like macros
* Simplify the implementation of macro logic
* Fix __is_identifier to correctly return '0' for non-identifiers

Reviewers: doug.gregor, rsmith

Subscribers: rsmith, cfe-commits

Differential Revision: http://reviews.llvm.org/D17149

llvm-svn: 265381

2016-04-05 08:36:47 +00:00

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