[Patch AArch64] Add support for crtfastmath.c

[Ramana Radhakrishnan]

Hi,

	It's worth setting up the FPCR to flush to zero, round to nearest modes 
especially under Ofast and ffast-math.

This patch attempts to do so and additionally cleans up ENDFILE_SPEC for 
AArch64 GNU/Linux targets.

Built and tested cross with aarch64-none-elf. A native bootstrap and 
test run was also done for aarch64-none-linux-gnu.

Ok for trunk ?

regards
Ramana


gcc/Changelog

2014-09-04  Marcus Shawcroft  <marcus.shawcroft@arm.com>
             Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>

            * config/aarch64/aarch64-elf-raw.h (ENDFILE_SPEC): Add 
crtfastmath.o.
            * config/aarch64/aarch64-linux.h 
(GNU_USER_TARGET_MATH_ENDFILE_SPEC): Define.
              (ENDFILE_SPEC): Define and use 
GNU_USER_TARGET_MATH_ENDFILE_SPEC.

libgcc/Changelog

2014-09-04  Marcus Shawcroft  <marcus.shawcroft@arm.com>
             Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>

                * config.host (aarch64*): Include crtfastmath and t-crtfm.
                * config/aarch64/crtfastmath.c: New file.