cmd/compile: incorrect code generation bug when taking slice[:0] [1.11 backport]

[gopherbot]

@FiloSottile requested issue #29502 to be considered for backport to the next 1.11 minor release.

@gopherbot please open a backport issue for 1.11.

[katiehockman]

@FiloSottile would you consider this to be a serious issue without a workaround? If so, then we can approve this candidate now that the fix is in.

[FiloSottile]

Yeah, this is a real miscompilation crash that was apparently detected in a real application.

[mvdan]

It was found by another developer; see #29833.

[tandr]

So it is safe to assume this did not get into 1.11.5 even that it was approved for cherrypick, am I right?

[FiloSottile]

Correct, this got pushed to Go 1.11.6 because 1.11.5 was a security-only release.

[kkv0id]

Correct, this got pushed to Go 1.11.6 because 1.11.5 was a security-only release.

hi, When will the Go 1.11.6 be released?