[PATCH] Add REGISTERS_CLOBBERED_BY_SYSCALL for x86-64

[Mike Frysinger]

On 15 Dec 2015 12:57, H.J. Lu wrote:
> X86-64 system calls use a different calling convention, which clobbers
> CC, %r11 an %rcx registers.  Define REGISTERS_CLOBBERED_BY_SYSCALL for
> x86-64 inline asm statements.
> 
> Tested on x86-64.  OK for master?

lgtm
-mike
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