lispregs.h, sparc-lispregs.h:
o Move the SC_OFFSET_{HI,LO} macros from sparc-lispregs to lispregs.h, so they can be used elsewhere. ppc-lispregs.h: o Define the register numbers so they can be used in the SC_OFFSET macros. ppc-assem.S: o Document what the byte 18<<2, 0, 0, 24 is supposed to do. o Use the SC_OFFSET macros in undefined_tramp instead of hard-wiring the register number.
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