Use unified syntax for builtins/arm/aeabi_mem*.S.

[Kor Nielsen via llvm-commits]

Use unified syntax for builtins/arm/aeabi_mem*.S.

This makes these files consistent with the others.

Without this change, __aeabi_memcpy (for thumb) is assembled like this:

00000000 <__aeabi_memcpy>:
   0:   e7fe            b.n     0 <memcpy>

This can cause trouble for the linker, which can fail with the message
"relocation truncated to fit: R_ARM_THM_JUMP11 against symbol"

With this change, the assembler generates this:

00000000 <__aeabi_memcpy>:
   0:   f7ff bffe       b.w     0 <memcpy>
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