c-decl.c rewrite - final

[Zack Weinberg]

Here's the final version of the big c-decl.c rewrite.  To reiterate
the caveats:

- The patch induces a handful of regressions in the objc testsuite.
  Ziemowit Laski has promised to fix these.

- Inter-module optimization is broken to the point where I have
  forcibly disabled it.  I do not believe it will be terribly
  difficult to get it working again.

- The patch does not address PRs 7993, 12336, 13801, or 13956.
  Given the nature of 7993 I would like to ask that one of the
  Objective-C maintainers investigate applying to the 3.4 branch the
  patch that was already applied to the 3.3 branch - it needs fixing
  up to apply cleanly, but should not require a total rewrite.  The
  others I will get to in due course.

I will be out of town from tomorrow until April 2nd, and cannot
promise to do anything about the above issues until Monday the 5th,
nor can I promise to address other issues caused by this patch until
then.  I will, however, be reading my email intermittently.

Bootstrapped i686-linux (all languages except Ada and treelang);
applied to mainline.

zw

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