[gcc-in-cxx] Fix fold-const.c for C++

[Ian Lance Taylor]

I committed this patch to the gcc-in-cxx branch to fix compiling
fold-const.c with C++.  Just more enum issues.

Ian


2009-02-03  Ian Lance Taylor  <iant@google.com>

	* fold-const.c (fold_undefer_overflow_warnings): Add cast to enum
	type.
	(combine_comparisons): Change compcode to int.  Add cast.


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