Hi all,

This is a simple patch to add another two ACLE 2.0 predefined macros 
into aarch64 backend.
They are __ARM_ALIGN_MAX_PWR and __ARM_ALIGN_MAX_STACK_PWR. Currently, 
those two values are hard-wired to 16.

The following clauses from ACLE 2.0 documentation indicate the meaning 
of those two macros:

The macro __ARM_ALIGN_MAX_STACK_PWR indicates (as the exponent of a 
power of 2) the maximum available stack alignment.
The macro __ARM_ALIGN_MAX_PWR indicates (as the exponent of a power of 
2) the maximum available alignment of static data.

aarch64-none-elf target is tested on on the model. No new regression.

Is it Okay for trunk?

Regards,
Renlin Li

gcc/ChangeLog

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

         * config/aarch64/aarch64.h(TARGET_CPU_CPP_BUILTINS): Define 
__ARM_ALIGN_MAX_PWR
         and __ARM_ALIGN_MAX_STACK_PWR.