Fix incorrect assert in BinaryenHostGetOperand (#2393)

Author: brmorr

src/binaryen-c.cpp

@@ -2151,7 +2151,7 @@ BinaryenExpressionRef BinaryenHostGetOperand(BinaryenExpressionRef expr,
   }
 
   auto* expression = (Expression*)expr;
-  assert(expression->is<Call>());
+  assert(expression->is<Host>());
   assert(index < static_cast<Host*>(expression)->operands.size());
   return static_cast<Host*>(expression)->operands[index];
 }

test/binaryen.js/kitchen-sink.js

@@ -941,6 +941,15 @@ function test_for_each() {
   module.dispose();
 }
 
+function test_expression_info() {
+  module = new Binaryen.Module();
+
+  // Issue #2392
+  console.log("getExpressionInfo(memory.grow)=" + JSON.stringify(Binaryen.getExpressionInfo(module.memory.grow(1))));
+
+  module.dispose();
+}
+
 function main() {
   test_types();
   test_features();
@@ -954,6 +963,7 @@ function main() {
   test_parsing();
   test_internals();
   test_for_each();
+  test_expression_info();
 }
 
 main();

test/binaryen.js/kitchen-sink.js.txt

@@ -9719,3 +9719,5 @@ sizeof Literal: 24
   (nop)
  )
 )
+
+getExpressionInfo(memory.grow)={"id":20,"type":1,"op":1,"nameOperand":"","operands":[1]}