[wasm] Enforce that function bodies end with the \"end\" opcode.

test/unittests/wasm/wasm-macro-gen-unittest.cc

Index: test/unittests/wasm/wasm-macro-gen-unittest.cc
diff --git a/test/unittests/wasm/wasm-macro-gen-unittest.cc b/test/unittests/wasm/wasm-macro-gen-unittest.cc
index 201316ddc97bac5660c635105c211a74b59a88fd..fb98fec3c17e54f52e309be73f646b6d11487263 100644
--- a/test/unittests/wasm/wasm-macro-gen-unittest.cc
+++ b/test/unittests/wasm/wasm-macro-gen-unittest.cc
@@ -49,6 +49,7 @@ TEST_F(WasmMacroGenTest, Constants) {
 
 TEST_F(WasmMacroGenTest, Statements) {
   EXPECT_SIZE(1, WASM_NOP);
+  EXPECT_SIZE(1, WASM_END);
 
   EXPECT_SIZE(4, WASM_SET_LOCAL(0, WASM_ZERO));