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go1.7rc1

go1.7rc1: [release-branch.go1.7] runtime: fix nanotime for macOS Sierra
@ianlancetaylor ianlancetaylor tagged this 08 Jul 03:48 
In the beta version of the macOS Sierra (10.12) release, the
gettimeofday system call changed on x86. Previously it always returned
the time in the AX/DX registers. Now, if AX is returned as 0, it means
that the system call has stored the values into the memory pointed to by
the first argument, just as the libc gettimeofday function does. The
libc function handles both cases, and we need to do so as well.

Fixes #16272.

Change-Id: Ibe5ad50a2c5b125e92b5a4e787db4b5179f6b723
Reviewed-on: https://go-review.googlesource.com/24812
Reviewed-by: Brad Fitzpatrick <[email protected]>
Reviewed-on: https://go-review.googlesource.com/24755
Reviewed-by: Chris Broadfoot <[email protected]>
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