* Use const char * in places where we want to assign string constants.
Avoid warnings when compiling with -Wextra:
* Avoid if statement with empty body in amcsshe.c
* Avoid comparison of unsigned >= 0.
Copied from Perforce
Change: 183498
ServerID: perforce.ravenbrook.com
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.
Copied from Perforce
Change: 182791
ServerID: perforce.ravenbrook.com
