[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 e79dd562bb6393fe31ae6883bcfe518f0467ea3b..4e232d224a189ec6972fca8e584ffd010a53c3a0 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1576,6 +1576,7 @@ 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",
@@ -1807,7 +1808,6 @@ 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",
@@ -2564,8 +2564,8 @@ 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)",
     ]
   }