tcg-sparc: Tidy call+jump patterns

Signed-off-by: Richard Henderson <rth@twiddle.net>
tcg-sparc: Use intptr_t as appropriate

Signed-off-by: Richard Henderson <rth@twiddle.net>
tcg-sparc: Always use 64-bit registers

Signed-off-by: Richard Henderson <rth@twiddle.net>
tcg-sparc: Don't handle mulu2_i32

Using the 64-bit MULX is better than UMUL+RDY.

Signed-off-by: Richard Henderson <rth@twiddle.net>
tcg-sparc: Don't handle remainder

The generic fallback is exactly what we implemented.

Signed-off-by: Richard Henderson <rth@twiddle.net>