tcg: fix deposit_i64 op on 32-bit targets

On 32-bit TCG targets, when emulating deposit_i64 with a mov_i32 +
deposit_i32, care should be taken to not overwrite the low part of
the second argument before the deposit when it is the same the
destination.

This fixes the shld instruction in qemu-system-x86_64, which in turns
fixes booting "system rescue CD version 2.8.0" on this target.

Reported-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

tcg/tcg-op.h

@@ -2188,9 +2188,9 @@ static inline void tcg_gen_deposit_i64(TCGv_i64 ret, TCGv_i64 arg1,
 
 #if TCG_TARGET_REG_BITS == 32
     if (ofs >= 32) {
-        tcg_gen_mov_i32(TCGV_LOW(ret), TCGV_LOW(arg1));
         tcg_gen_deposit_i32(TCGV_HIGH(ret), TCGV_HIGH(arg1),
                             TCGV_LOW(arg2), ofs - 32, len);
+        tcg_gen_mov_i32(TCGV_LOW(ret), TCGV_LOW(arg1));
         return;
     }
     if (ofs + len <= 32) {