GCInfoIndex cannot be used for a canonicalization of type names.

Example by omerkatz:
struct A : public GCed<A>, public NameProvider {
 override const char* GetHumanReadableName() { return "A"; }
};
struct B : public A {
 override const char* GetHumanReadableName() { return "B"; }
};

A and B will have the same GCInfoIndex but different type names.

Bug: chromium:1056170
Change-Id: I35b76a0d80498b8c39e3788f6c2556cdb29f3a7b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3013311
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75649}