introduce SH 2a simulator

[Alexandre Oliva]

This patch adds support for SH 2a to the simulator.  I'll post patches
for GDB later on.  Ok?  Tested on i686-pc-linux-gnu-x-sh-elf.

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-- 
Alexandre Oliva             http://www.ic.unicamp.br/~oliva/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}