[SH] Fix simulator on 64 bit hosts

[Oleg Endo]

Hi,

The attached patch fixes the SH simulator when ran on 64 bit hosts.  It
seems there are quite a few adventurous or at least confusing integer
type casts, but the main problem was the widening 32 x 32 -> 64 bit
multiplication.

Tested by running the GCC testsuite and checking that 32 bit sim and 64
bit sim produce the same test results.

Cheers,
Oleg

sim/sh/ChangeLog:

	* interp.c (dmul): Split into dmul_s and dmul_u.  Use explicit 
	integer width types and simplify implementation.
	* gencode.c (dmuls.l, dmulu.l): Use new functions dmul_s and 
	dmul_u.
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