mcs51 simulator: redesign of inst decoder
sdcc (z80) segfault on solaris/i386/gcc4.8
enable tlcs90 regtests
use writable flash for stm8 tests
Fix use of bare `ar` instead of $(AR) in ucsim Makefiles
Thank you Grisses, I've included your patch in next commit [r9845].
Some STM8 regtest fails if flash is read-only