[Patch][ARM]Don't put volatile memory access in IT block for cortex-m7

[Terry Guo]

Hi there,

This patch intends to prevent gcc from putting volatile memory access into
IT block for target like cortex-m7.

gcc/ChangeLog:

2015-02-12  Terry Guo  <terry.guo@arm.com>

	* config/arm/arm.c (arm_tune_cortex_m7): New global variable.
	* config/arm/arm.h (TARGET_NO_VOLATILE_CE): New macro.
                (arm_tune_cortex_m7): Declare new global variable.
	* config/arm/arm.md (arm_comparison_operator): Disabled if not allow
                 volatile memory access in IT block.

gcc/testsuite/ChangeLog:

2015-02-12  Terry Guo  <terry.guo@arm.com>

	* gcc.target/arm/cortex-m7-it-volatile.c: New test.
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