libgo patch committed: Record g0 top of stack correctly when not split

[Ian Lance Taylor]

This patch to libgo records the top of the g0 goroutine stack correctly
when not using -fsplit-stack.  Without this patch the garbage collector
would scan beyond the top of the stack when looking at the g0 stack,
which could cause segmentation violations.  Bootstrapped and ran Go
testsuite on x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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