[Wasm GC] Implement static (rtt-free) StructNew, ArrayNew, ArrayInit (#4172)

See #4149

This modifies the test added in #4163 which used static casts on
dynamically-created structs and arrays. That was technically not
valid (as we won't want users to "mix" the two forms). This makes that
test 100% static, which both fixes the test and gives test coverage
to the new instructions added here.

1 files changed, 27 insertions, 11 deletions

diff --git a/src/passes/Print.cpp b/src/passes/Print.cpp
index 6198218d8..6a41961a2 100644
--- a/src/passes/Print.cpp
+++ b/src/passes/Print.cpp
@@ -1985,15 +1985,18 @@ struct PrintExpressionContents
   }
 
   void visitStructNew(StructNew* curr) {
-    if (printUnreachableReplacement(curr->rtt)) {
+    if (printUnreachableReplacement(curr)) {
       return;
     }
-    printMedium(o, "struct.new_");
+    printMedium(o, "struct.new");
     if (curr->isWithDefault()) {
-      o << "default_";
+      printMedium(o, "_default");
     }
-    o << "with_rtt ";
-    TypeNamePrinter(o, wasm).print(curr->rtt->type.getHeapType());
+    if (curr->rtt) {
+      printMedium(o, "_with_rtt");
+    }
+    o << ' ';
+    TypeNamePrinter(o, wasm).print(curr->type.getHeapType());
   }
 
   void printFieldName(HeapType type, Index index) {
@@ -2035,16 +2038,29 @@ struct PrintExpressionContents
     printFieldName(heapType, curr->index);
   }
   void visitArrayNew(ArrayNew* curr) {
-    printMedium(o, "array.new_");
+    if (printUnreachableReplacement(curr)) {
+      return;
+    }
+    printMedium(o, "array.new");
     if (curr->isWithDefault()) {
-      o << "default_";
+      printMedium(o, "_default");
+    }
+    if (curr->rtt) {
+      printMedium(o, "_with_rtt");
     }
-    o << "with_rtt ";
-    TypeNamePrinter(o, wasm).print(curr->rtt->type.getHeapType());
+    o << ' ';
+    TypeNamePrinter(o, wasm).print(curr->type.getHeapType());
   }
   void visitArrayInit(ArrayInit* curr) {
-    printMedium(o, "array.init ");
-    TypeNamePrinter(o, wasm).print(curr->rtt->type.getHeapType());
+    if (printUnreachableReplacement(curr)) {
+      return;
+    }
+    printMedium(o, "array.init");
+    if (!curr->rtt) {
+      printMedium(o, "_static");
+    }
+    o << ' ';
+    TypeNamePrinter(o, wasm).print(curr->type.getHeapType());
   }
   void visitArrayGet(ArrayGet* curr) {
     if (printUnreachableReplacement(curr->ref)) {