[PATCH] cpu.c: merge ia32_cpu_info() and x86_64_cpu_info()

ia32_cpu_info() and x86_64_cpu_info() functions became very
similar after the removal of OS SSE detection stuff.
It makes sense to merge them to make the code less redundant.

All 32/64-bit specific code was moved into separate helper functions.
Now the structure of cpu.c is basically this:


  ... includes

#if CONDITION
    ... helper functions and definitions
#endif

static void x86_cpu_info(FLAC__CPUInfo *info)
{
#if CONDITION
     ... code
#else
	info->use_asm = false;
#endif
}



I tried to move all #ifdefery into those small helper functions,
to simplify x86_cpu_info().

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