[gn] Enable stricter build flags

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 fb98fec3c17e54f52e309be73f646b6d11487263..4f21b7e9e9800510fc5797532e2d2f9f07ce3a60 100644
--- a/test/unittests/wasm/wasm-macro-gen-unittest.cc
+++ b/test/unittests/wasm/wasm-macro-gen-unittest.cc
@@ -15,6 +15,7 @@ class WasmMacroGenTest : public TestWithZone {};
 #define EXPECT_SIZE(size, ...)                          \
   do {                                                  \
     byte code[] = {__VA_ARGS__};                        \
+    USE(code);                                          \
     EXPECT_EQ(static_cast<size_t>(size), sizeof(code)); \
   } while (false)