Implement table.init and elem.drop from the bulk memory proposal

tests/misc_testsuite/elem-ref-null.wast

@@ -0,0 +1,2 @@
+(module
+  (elem funcref (ref.null)))

tests/misc_testsuite/elem_drop.wast

@@ -0,0 +1,7 @@
+(module
+  (table 1 1 funcref)
+  (elem (i32.const 0) funcref (ref.func 0))
+  (func (export "elem.drop non-passive element")
+    (elem.drop 0)))
+
+(invoke "elem.drop non-passive element")

tests/wast_testsuites.rs

@@ -20,6 +20,8 @@ fn run_wast(wast: &str, strategy: Strategy) -> anyhow::Result<()> {
     let bulk_mem = reftypes
         || wast.iter().any(|s| s == "bulk-memory-operations")
         || wast.iter().any(|s| s == "table_copy.wast")
+        || wast.iter().any(|s| s == "elem_drop.wast")
+        || wast.iter().any(|s| s == "elem-ref-null.wast")
         || wast
             .iter()
             .any(|s| s == "table_copy_on_imported_tables.wast");