target-tricore: Cleanup and Bugfixes

target-tricore: Cleanup and Bugfixes

Move FCX loading of save_context_ to caller functions, for STLCX, STUCX insn to use those functions.
Move FCX storing of restore_context_ to caller functions, for LDLCX, LDUCX insn to use those functions.
Remove do_raise_exception function, which caused clang to emit a warning.
Fix: save_context_lower now saves a[11] instead of PSW.
Fix: MASK_OP_ABSB_BPOS starting at wrong offset.

Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Reviewed-by: Richard Henderson <rth@twiddle.net>