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When we call IndexedMemProfRecord::toMemProfRecord, we care about
getting the original (that is, non-indexed) MemProfRecord back, so we
should just verify that, not the hash values, which are
intermediaries.
There is a remote possibility of hash collisions where call stack
{F1, F2} might come back as {F1, F1} if F1.hash() == F2.hash() for
example. However, since FrameId uses BLAKE, the hash values should be
consistent across architectures. That is, if this test case works on
one architecture, it should work on others as well.
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