Replace wabt with rust tools (#5)

tests/expectations/stack-height/many_locals.wat

@@ -1,8 +1,8 @@
 (module
   (type (;0;) (func))
-  (func (;0;) (type 0)
+  (func $one-group-many-locals (type 0)
     (local i64 i64 i32))
-  (func (;1;) (type 0)
+  (func $main (type 0)
     global.get 0
     i32.const 5
     i32.add
@@ -13,9 +13,9 @@
     if  ;; label = @1
       unreachable
     end
-    call 0
+    call $one-group-many-locals
     global.get 0
     i32.const 5
     i32.sub
     global.set 0)
-  (global (;0;) (mut i32) (i32.const 0)))
+  (global (;0;) (mut i32) i32.const 0))