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Yhc/Debug flags

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A number of debug flags are available to help when hacking the compiler. These have varying names and are numerous, I propose a change. This page documents the proposed change, not the existing set of flags.

Flags

-code=* - show the code at all available stages. Values such as -code=rename,type would show the code at the rename and type stages.

-st=... - same as code, for the symbol table

-bc=... - same as byte code, but different values for the stages

Thoughts?