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runtime: reset DF flag after running external code on 386
R=r CC=golang-dev https://golang.org/cl/186108
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@ -350,6 +350,10 @@ TEXT runcgo(SB),7,$16
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MOVL CX, 4(SP)
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MOVL BX, 0(SP)
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CALL AX
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// Back; switch to original stack, re-establish
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// "DF is clear" invariant.
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CLD
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MOVL 4(SP), SP
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RET
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