Rename functions Prot{Can,}StepInstruction to MutatorContext{Can,}StepInstruction so that they follow the naming convention in guide.implc.naming.prefix.program.
Move mutator context declarations out of prot.h into new header prmc.h.
Correct .assume.null in a couple of places -- it's not safe for MutatorContextStepInstruction to return ResUNIMPL, instead MutatorContextCanStepInstruction should return FALSE.
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1. Where Type is a pointer type with a signature, replace CHECKL(TypeCheck(val)) with CHECKD(Type, val).
2. Where Type is a pointer type with no signature, replace CHECKL(TypeCheck(val)) with CHECKD_NOSIG(Type, val).
3. Where Type is a pointer type with a signature, but the structure is not visible at point of checking, replace CHECKL(TypeCheck(val)) with CHECKD_NOSIG(Type, val). Reference <design/check/#.hidden-type>
4. Make BTCheck extern and use it where possible.
5. Replace AVER(TypeCheck(val)) with AVERT(Type, val).
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Change: 185263
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Also switched to using platform specific Mutator Context code
so that we can read out the registers for instruction emulation
and stack scanning.
Builds on 64-bit but doesn't work because sem_init is unimplemented on
Mac OS X.
Not finished on 32-bit.
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Change: 182791
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This change will be integrated but ignored (-ay) to the gg-epcore/union sources, so that they retain HopeNames.
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Change: 24911
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This was achieved by partially undoing changelist 24817, including an accidental corruption of eventgen.pl.
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Change: 24877
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