[PATCH PR78691]Require integral type for pattern ((convert1 (minmax ((convert2 (x) c)))) -> minmax (x c))

[Bin Cheng]

Hi,
This patch fixes ICE reported by PR78691, it adds requirement of integral type for the outer
expression of pattern ((convert1 (minmax ((convert2 (x) c)))) -> minmax (x c)).
Test case checked on ppc, bootstrap and test on x86_64 ongoing, is it OK if no new failure?

Thanks,
bin

2016-12-06  Bin Cheng  <bin.cheng@arm.com>

	PR tree-optimization/78691
	* match.pd ((convert1 (minmax ((convert2 (x) c)))) -> minmax (x c)):
	Require integral type for the outer expression.

gcc/testsuite/ChangeLog
2016-12-06  Bin Cheng  <bin.cheng@arm.com>

	PR tree-optimization/78691
	* gcc.target/i386/pr78691-i386.c: New test.
	* gcc.target/powerpc/pr78691-ppc.c: New test.
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