JuliaLang / julia / #37474

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irinterp: Allow setting all IR flags (#48993)

Currently, `IR_FLAG_NOTHROW` is the only flag that irinterp is allowed to
set on statements, under the assumption that in order for a call to
be irinterp-eligible, it must have been proven `:foldable`, thus `:effect_free`,
and thus `IR_FLAG_EFFECT_FREE` was assumed to have been set. That reasoning
was sound at the time this code was written, but have since introduced
`EFFECT_FREE_IF_INACCESSIBLEMEMONLY`, which breaks the reasoning that
an `:effect_free` inference for the whole function implies the flag on
every statement. As a result, we were failing to DCE otherwise dead
statements if the IR came from irinterp.

3 of 3 new or added lines in 1 file covered. (100.0%)

70258 of 82316 relevant lines covered (85.35%)

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