Heuristically detecting ret - probably breaks some things.

src/alloy/hir/hir_builder.cc

@@ -563,6 +563,21 @@ void HIRBuilder::Return() {
   EndBlock();
 }
 
+void HIRBuilder::ReturnTrue(Value* cond) {
+  if (cond->IsConstant()) {
+    if (cond->IsConstantTrue()) {
+      Return();
+    }
+    return;
+  }
+
+  ASSERT_ADDRESS_TYPE(value);
+  Instr* i = AppendInstr(OPCODE_RETURN_TRUE_info, 0);
+  i->set_src1(cond);
+  i->src2.value = i->src3.value = NULL;
+  EndBlock();
+}
+
 void HIRBuilder::SetReturnAddress(Value* value) {
   Instr* i = AppendInstr(OPCODE_SET_RETURN_ADDRESS_info, 0);
   i->set_src1(value);

src/alloy/hir/hir_builder.h

@@ -75,6 +75,7 @@ public:
   void CallIndirect(Value* value, uint32_t call_flags = 0);
   void CallIndirectTrue(Value* cond, Value* value, uint32_t call_flags = 0);
   void Return();
+  void ReturnTrue(Value* cond);
   void SetReturnAddress(Value* value);
 
   void Branch(Label* label, uint32_t branch_flags = 0);

src/alloy/hir/opcodes.h

@@ -95,6 +95,7 @@ enum Opcode {
   OPCODE_CALL_INDIRECT,
   OPCODE_CALL_INDIRECT_TRUE,
   OPCODE_RETURN,
+  OPCODE_RETURN_TRUE,
   OPCODE_SET_RETURN_ADDRESS,
 
   OPCODE_BRANCH,

src/alloy/hir/opcodes.inl

@@ -80,6 +80,12 @@ DEFINE_OPCODE(
     OPCODE_SIG_X,
     OPCODE_FLAG_BRANCH);
 
+DEFINE_OPCODE(
+    OPCODE_RETURN_TRUE,
+    "return_true",
+    OPCODE_SIG_X_V,
+    OPCODE_FLAG_BRANCH);
+
 DEFINE_OPCODE(
     OPCODE_SET_RETURN_ADDRESS,
     "set_return_address",