[wasm] Managed<T> ensures T's lifetime does not leak past Isolate's

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index ecc9a7f34b3aa1b8c0024438b287ce8f01d253f0..76867cba9bd2158c092611b7f2a286d3895bb7ae 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1577,6 +1577,7 @@ v8_source_set("v8_base") {
     "src/machine-type.cc",
     "src/machine-type.h",
     "src/macro-assembler.h",
+    "src/managed.h",
     "src/map-updater.cc",
     "src/map-updater.h",
     "src/messages.cc",
@@ -1809,7 +1810,6 @@ v8_source_set("v8_base") {
     "src/wasm/function-body-decoder.cc",
     "src/wasm/function-body-decoder.h",
     "src/wasm/leb-helper.h",
-    "src/wasm/managed.h",
     "src/wasm/module-decoder.cc",
     "src/wasm/module-decoder.h",
     "src/wasm/signature-map.cc",
@@ -2566,8 +2566,8 @@ group("v8_clusterfuzz") {
   if (v8_multi_arch_build) {
     deps += [
       ":d8(//build/toolchain/linux:clang_x64)",
-      ":d8(//build/toolchain/linux:clang_x86)",
       ":d8(//build/toolchain/linux:clang_x64_v8_arm64)",
+      ":d8(//build/toolchain/linux:clang_x86)",
       ":d8(//build/toolchain/linux:clang_x86_v8_arm)",
     ]
   }