Reorder i31ref and dataref (#3509)

The binary spec
(https://docs.google.com/document/d/1yAWU3dbs8kUa_wcnnirDxUu9nEBsNfq0Xo90OWx6yuo/edit#)
lists `dataref` after `i31ref`, and `dataref` also comes after `i31ref`
in its binary code in the value-increasing order. This reorders these
two in wasm-type.h and other places, although in most of those places
the order is irrelevant.

This also adds C and JS API for `dataref`.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/wasm/wasm-binary.cpp b/src/wasm/wasm-binary.cpp
index 5a78bfc42..cc289e7ec 100644
--- a/src/wasm/wasm-binary.cpp
+++ b/src/wasm/wasm-binary.cpp
@@ -1413,12 +1413,12 @@ Type WasmBinaryBuilder::getType(int initial) {
     case BinaryConsts::EncodedType::nonnullable:
       // FIXME: for now, force all inputs to be nullable
       return Type(getHeapType(), Nullable);
-    case BinaryConsts::EncodedType::dataref:
-      // FIXME: for now, force all inputs to be nullable
-      return Type(HeapType::BasicHeapType::data, Nullable);
     case BinaryConsts::EncodedType::i31ref:
       // FIXME: for now, force all inputs to be nullable
       return Type(HeapType::BasicHeapType::i31, Nullable);
+    case BinaryConsts::EncodedType::dataref:
+      // FIXME: for now, force all inputs to be nullable
+      return Type(HeapType::BasicHeapType::data, Nullable);
     case BinaryConsts::EncodedType::rtt_n: {
       auto depth = getU32LEB();
       auto heapType = getHeapType();