Fix local variable allocations for functions with prototypes

Author: robertoraggi

src/mlir/cxx/mlir/codegen_declarations.cc

@@ -160,6 +160,10 @@ void Codegen::DeclarationVisitor::allocateLocals(ScopeSymbol* block) {
       allocateLocals(nestedBlock);
       continue;
     }
+    if (auto params = symbol_cast<FunctionParametersSymbol>(symbol)) {
+      allocateLocals(params);
+      continue;
+    }
 
     if (auto var = symbol_cast<VariableSymbol>(symbol)) {
       if (var->isStatic()) continue;
@@ -730,4 +734,4 @@ void Codegen::asmQualifier(AsmQualifierAST* ast) {}
 void Codegen::asmClobber(AsmClobberAST* ast) {}
 
 void Codegen::asmGotoLabel(AsmGotoLabelAST* ast) {}
-}  // namespace cxx
+}  // namespace cxx