Fix constant optimization on RV32A instructions

Address a requirement to handle RV32A instructions that may perform
register writes during constant optimization. As these instructions
could potentially modify registers, it's essential to incorporate
appropriate handling for such cases within constant optimization
routines.

Author: visitorckw

src/rv32_constopt.c

@@ -554,37 +554,67 @@ CONSTOPT(remu, {
 #if RV32_HAS(EXT_A)
 
 /* LR.W: Load Reserved */
-CONSTOPT(lrw, {})
+CONSTOPT(lrw, {
+    if (ir->rd)
+        info->is_constant[ir->rd] = false;
+})
 
 /* SC.W: Store Conditional */
 CONSTOPT(scw, {})
 
 /* AMOSWAP.W: Atomic Swap */
-CONSTOPT(amoswapw, {})
+CONSTOPT(amoswapw, {
+    if (ir->rd)
+        info->is_constant[ir->rd] = false;
+})
 
 /* AMOADD.W: Atomic ADD */
-CONSTOPT(amoaddw, {})
+CONSTOPT(amoaddw, {
+    if (ir->rd)
+        info->is_constant[ir->rd] = false;
+})
 
 /* AMOXOR.W: Atomic XOR */
-CONSTOPT(amoxorw, {})
+CONSTOPT(amoxorw, {
+    if (ir->rd)
+        info->is_constant[ir->rd] = false;
+})
 
 /* AMOAND.W: Atomic AND */
-CONSTOPT(amoandw, {})
+CONSTOPT(amoandw, {
+    if (ir->rd)
+        info->is_constant[ir->rd] = false;
+})
 
 /* AMOOR.W: Atomic OR */
-CONSTOPT(amoorw, {})
+CONSTOPT(amoorw, {
+    if (ir->rd)
+        info->is_constant[ir->rd] = false;
+})
 
 /* AMOMIN.W: Atomic MIN */
-CONSTOPT(amominw, {})
+CONSTOPT(amominw, {
+    if (ir->rd)
+        info->is_constant[ir->rd] = false;
+})
 
 /* AMOMAX.W: Atomic MAX */
-CONSTOPT(amomaxw, {})
+CONSTOPT(amomaxw, {
+    if (ir->rd)
+        info->is_constant[ir->rd] = false;
+})
 
 /* AMOMINU.W */
-CONSTOPT(amominuw, {})
+CONSTOPT(amominuw, {
+    if (ir->rd)
+        info->is_constant[ir->rd] = false;
+})
 
 /* AMOMAXU.W */
-CONSTOPT(amomaxuw, {})
+CONSTOPT(amomaxuw, {
+    if (ir->rd)
+        info->is_constant[ir->rd] = false;
+})
 #endif /* RV32_HAS(EXT_A) */
 
 /* RV32F Standard Extension */