Fix runtime type bug with c_ptr.eltType #28291
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Fixes an issue where runtime types where not properly removed when compiling code with
--debug.The bug is really that the compiler doesn't know how to codegen types (which it shouldn't) and earlier phases of the compiler don't remove some type calls properly. This makes
--dead-code-eliminationan essential pass to run. However, DCE, can remove important information when debugging. To workaround this, this PR partially re-enables DCE with--debug, keeping enough to make the compiler not crash.Resolves
--debug#28285 work with--debug