target/sparc: Relax decode of rs2_or_imm for v7

For v7, bits [12:5] are ignored for !imm.
For v8, those same bits are reserved, but are not trapped.

Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
1 file changed