[MemProf] Convert Hot contexts to NotCold early (#124219)

While we convert hot contexts to notcold contexts during the cloning
step, their existence was greatly limiting the context trimming
performed when we add the MemProf profile to the IR. To address this,
any hot contexts are converted to notcold contexts immediately after
first checking for unambiguous allocation types, and before checking it
again and before adding metadata while performing context trimming.

Note that hot hints are now disabled by default, however, this avoids
adding unnecessary overhead if they are re-enabled.

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