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9a5b055b95c6719083f32c1f8089725a0a890425 runtime: update docs, code for SetFinalizer
At last minute before 1.3 we relaxed SetFinalizer to avoid
crashes when you pass the result of a global alloc to it.
This avoids the crash but makes SetFinalizer a bit too relaxed.
Document that the finalizer of a global allocation may not run.
Tighten the SetFinalizer check to ignore a global allocation but
not ignore everything else.
Fixes #7656.
LGTM=r, iant
R=golang-codereviews, iant, r
CC=dvyukov, golang-codereviews, khr, rlh
https://golang.org/cl/145930043
2 files changed
