[x265] ASM crash in r6706

[chen]

>> In this case, x264asm don't do it because HAVE_ALIGNED_STACK=1
>> the input stack is aligned, but we need push 3 regs into stack, so we got a
>> stack mistake.
>
>Again, that's not how it works.
>
>HAVE_ALIGNED_STACK means x264asm can assume the input stack is aligned.
>
>It does not mean x264asm magically stops handling stack alignment.
>
>HAVE_ALIGNED_STACK exists to compensate for compilers such as Intel's
>that don't perform stack alignment.  It has _absolutely nothing_ to do
>with x264asm's own pushing registers onto the stack.

Sorry, my mistake.
Latest version x264asm solve this bug, we x265 use old one, there have a condition '%if mmsize <= 16 && HAVE_ALIGNED_STACK'
 
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