Fix occurrences of left-shifting negative constants in C code.
sim/arm/ChangeLog:
* thumbemu.c (handle_T2_insn): Fix left shift of negative value.
* armemu.c (handle_v6_insn): Likewise.
sim/avr/ChangeLog:
* interp.c (sign_ext): Fix left shift of negative value.
sim/mips/ChangeLog:
* micromips.igen (process_isa_mode): Fix left shift of negative
value.
sim/msp430/ChangeLog:
* msp430-sim.c (get_op, put_op): Fix left shift of negative value.
sim/v850/ChangeLog:
* simops.c (v850_bins): Fix left shift of negative value.