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tcg/mips: Improve the add2/sub2 command to use TCG_TARGET_REG_BITS
Instead of hard coding 31 for the shift right use TCG_TARGET_REG_BITS - 1. Backports commit 161dec9d1b03552e78e5728186eae9cf1dfbe035 from qemu
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@ -1606,7 +1606,7 @@ static void tcg_out_addsub2(TCGContext *s, TCGReg rl, TCGReg rh, TCGReg al,
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tcg_out_opc_imm(s, OPC_ADDIU, rl, al, bl);
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tcg_out_opc_imm(s, OPC_SLTIU, TCG_TMP0, rl, bl);
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} else if (rl == al && rl == bl) {
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tcg_out_opc_sa(s, OPC_SRL, TCG_TMP0, al, 31);
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tcg_out_opc_sa(s, OPC_SRL, TCG_TMP0, al, TCG_TARGET_REG_BITS - 1);
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tcg_out_opc_reg(s, OPC_ADDU, rl, al, bl);
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} else {
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tcg_out_opc_reg(s, OPC_ADDU, rl, al, bl);
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