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RwLock, rather that SafepointRwLock, is okay to use for these two breakpoint_locations and single_stepping_set locks because they are short-lived, should not spawn over the safepoint. TEST=ci Change-Id: Iba83291978ba7980d0c6fd0a0a2cf2174c801359 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/323202 Reviewed-by: Ryan Macnak <rmacnak@google.com> Commit-Queue: Alexander Aprelev <aam@google.com>