[m68k] Integrate Motorola Integer Software Package (68060SP), for '060 #492
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support - Add 68060SP ISP code to external/arch/m68k - Install _060_isp_unimp handler for "Unimplemented Integer Instruction" exception - Add 68060 CPU target
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Some design choices that need scrutiny:
The '_060_isp_unimp' routine is a weak symbol to allow things to build when the ISP code is not being assembled/linked.
In arch/m68k/rules.mk there is a conditional that performs a pattern match, rather than shelling out to numeric comparison or similar. The ISP code fails to build '010 targets like rosco, hence the gating.