AppleObjCRuntimeV2 prints a warning when we read libobjc.A.dylib from
memory, as a canary to detect that we are reading system binaries out of
memory (which is slow, and we try hard to avoid). But with a corefile,
reading out of "memory" is fine, and may be the only way we can find the
correct binary.
rdar://144322688
3c2ba68915