[PATCH][ARM]Fix __ARM_SIZEOF_WCHAR_T definition.

[Renlin Li]

Hi all,

According to ACLE 2.0, the value of __ARM_SIZEOF_WCHAR_T should be 
defined in terms of byte, which means it should be 2 or 4. This patch 
corrects the error in arm backend.

arm-none-eabi regression test has been done, no new issues.

Okay for trunk?


Regards,
Renlin Li

gcc/ChangeLog:

2014-12-16 Renlin Li <renlin.li@arm.com>

         * config/arm/arm.h (TARGET_CPU_CPP_BUILTINS): Correct
         __ARM_SIZEOF_WCHAR_T macro definition.

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