[C++ PATCH] Precedence-based parsing

[Paolo Bonzini]

 From PR14179's trail:

 > Paolo --
 >
 > This patch is great.  My only comment is that I would like the grammar
 > entries that used to be above the various functions (pm-expression:
 > ..., etc.) to be preserved above the rewritten binary_expression
 > function.  Please check in!

I'm finishing regtesting it, then I'll commit it as preapproved.

Paolo
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