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runtime: fix madvise for freebsd/amd64
Make use of carry clear condition instead of low or same. R=minux.ma, jsing, dave CC=golang-dev https://golang.org/cl/6844080
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@ -190,8 +190,7 @@ TEXT runtime·madvise(SB),7,$0
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MOVQ 24(SP), DX
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MOVQ $75, AX // madvise
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SYSCALL
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CMPQ AX, $0xfffffffffffff001
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JLS 2(PC)
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JCC 2(PC)
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MOVL $0xf1, 0xf1 // crash
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RET
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