runtime, cmd/compile: rename memclr -> memclrNoHeapPointers Since barrier-less memclr is only safe in very narrow circumstances, this commit renames memclr to avoid accidentally calling memclr on typed memory. This can cause subtle, non-deterministic bugs, so it's worth some effort to prevent. In the near term, this will also prevent bugs creeping in from any concurrent CLs that add calls to memclr; if this happens, whichever patch hits master second will fail to compile. This also adds the other new memclr variants to the compiler's builtin.go to minimize the churn on that binary blob. We'll use these in future commits. Updates #17503. Change-Id: I00eead049f5bd35ca107ea525966831f3d1ed9ca Reviewed-on: https://go-review.googlesource.com/31369 Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Rick Hudson <rlh@golang.org>
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