Remove built-in cache_hit tracking

This was already only enabled in debug_assertions builds. Generally, it seems
like most use cases that would use this could also use the -Zself-profile flag
which also tracks cache hits (in all builds), and so the extra cfg's and such
are not really necessary.

This is largely just a small cleanup though, which primarily is intended to make
other changes easier by avoiding the need to deal with this field.

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