[PATCH] ARM: Avoid unnecessary FPSCR writes

[Wilco]

Hi,

This patch speeds up the ARM fenv implementation by avoiding unnecessary FPSCR writes if the FPSCR
remains unchanged.

OK for commit?

Wilco

ChangeLog:
2014-05-23  Wilco  <wdijkstr@arm.com>

	* sysdeps/arm/fclrexcpt.c (feclearexcept):
	Optimize to avoid unnecessary FPSCR writes.
	* sysdeps/arm/fedisblxcpt.c (fedisableexcept): Likewise.
	* sysdeps/arm/feenablxcpt.c (feenableexcept): Likewise.
	* sysdeps/arm/fsetexcptflg.c (fesetexceptflag): Likewise.
	* sysdeps/arm/setfpucw.c (__setfpucw): Likewise.
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