[PATCH][ARM][gas] Fix warnings about uninitialised uses and unused const variables

[Kyrill Tkachov]

Hi all,

I recently upgraded my host compiler to GCC 6.1.0 and while trying to build a
cross toolchain for arm-none-eabi I've encountered some -Werror errors in tc-arm.c
This patch fixes them.

Some static const variables that are unused are marked with ATTRIBUTE_UNUSED.
In parse_neon_el_struct_list GCC complains that firsttype.index may be used
uninitialized in an inlined neon_alias_types_same call.
This patch initialises the fields firsttype to prevent that.

With this patch the gas build succeeds for me.
Tested with make check-gas for arm-none-eabi.

Ok to commit?

Thanks,
Kyrill

2016-04-29  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     * config/tc-arm.c (fpu_arch_vfp_v1): Mark with ATTRIBUTE_UNUSED.
     (fpu_arch_vfp_v3): Likewise.
     (fpu_arch_neon_v1): Likewise.
     (arm_arch_full): Likewise.
     (parse_neon_el_struct_list): Initialize fields of firsttype.
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