[Patch 3/11] Implement TARGET_C_EXCESS_PRECISION for s390

[James Greenhalgh]

Hi,

This patch ports the logic from s390's TARGET_FLT_EVAL_METHOD to the new
target hook TARGET_C_EXCESS_PRECISION.

Patch tested by building an s390-none-linux toolchain and running
s390.exp (without the ability to execute) with no regressions, and manually
inspecting the output assembly code when compiling
testsuite/gcc.target/i386/excess-precision* to show no difference in
code-generation.

OK?

Thanks,
James

---
gcc/

2016-09-30  James Greenhalgh  <james.greenhalgh@arm.com>

	* config/s390/s390.c (s390_excess_precision): New.
	(TARGET_C_EXCESS_PRECISION): Define.

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