Update the walrus dependency (#2125)

This commit updates the `walrus` crate used in `wasm-bindgen`. The major
change here is how `walrus` handles element segments, exposing segments
rather than trying to keep a contiugous array of all the elements and
doing the splitting itself. That means that we need to do mroe logic
here in `wasm-bindgen` to juggle indices, segments, etc.

crates/multi-value-xform/Cargo.toml

@@ -13,12 +13,12 @@ edition = "2018"
 
 [dependencies]
 anyhow = "1.0"
-walrus = "0.14.0"
+walrus = "0.16.0"
 
 [dev-dependencies]
 rayon = "1.0"
 wasmprinter = "0.2"
-wast = "3.0"
+wast = "15.0"
 wat = "1.0"
 
 [[test]]

crates/multi-value-xform/src/lib.rs

@@ -162,10 +162,12 @@ fn xform_one(
                 round_up_to_alignment(results_size, 8) + 8
             }
             walrus::ValType::V128 => round_up_to_alignment(results_size, 16) + 16,
-            walrus::ValType::Anyref => anyhow::bail!(
-                "cannot multi-value transform functions that return \
-                 anyref, since they can't go into linear memory"
-            ),
+            walrus::ValType::Anyref | walrus::ValType::Funcref | walrus::ValType::Nullref => {
+                anyhow::bail!(
+                    "cannot multi-value transform functions that return \
+                     reference types, since they can't go into linear memory"
+                )
+            }
         };
     }
     // Round up to 16-byte alignment, since that's what LLVM's emitted Wasm code
@@ -284,7 +286,9 @@ fn xform_one(
                 );
                 offset += 16;
             }
-            walrus::ValType::Anyref => unreachable!(),
+            walrus::ValType::Anyref | walrus::ValType::Funcref | walrus::ValType::Nullref => {
+                unreachable!()
+            }
         }
     }