[wasm] Temporarily disable native module cache

v8.1 has a stability issue where we free code too early. Thus disable
for now, such that we can merge this back to v8.1.
v8.2 does not have this problem, since https://crrev.com/c/2078583 fixed
it. This CL is not easily backmergable though.

R=tebbi@chromium.org

Bug: chromium:1070199, chromium:1070182
Change-Id: I4bf468b3e7b5b1e66b314907f844d4195b3ff029
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2144966
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67103}

src/wasm/wasm-engine.cc

@@ -161,6 +161,9 @@ class WeakScriptHandle {
 std::shared_ptr<NativeModule> NativeModuleCache::MaybeGetNativeModule(
     ModuleOrigin origin, Vector<const uint8_t> wire_bytes) {
   if (origin != kWasmOrigin) return nullptr;
+  // Temporarily disabled to fix stability issue on M-81
+  // (https://crbug.com/1070199).
+  if (!FLAG_future) return nullptr;
   base::MutexGuard lock(&mutex_);
   size_t prefix_hash = PrefixHash(wire_bytes);
   NativeModuleCache::Key key{prefix_hash, wire_bytes};
@@ -192,6 +195,9 @@ std::shared_ptr<NativeModule> NativeModuleCache::MaybeGetNativeModule(
 }
 
 bool NativeModuleCache::GetStreamingCompilationOwnership(size_t prefix_hash) {
+  // Temporarily disabled to fix stability issue on M-81
+  // (https://crbug.com/1070199).
+  if (!FLAG_future) return true;
   base::MutexGuard lock(&mutex_);
   auto it = map_.lower_bound(Key{prefix_hash, {}});
   if (it != map_.end() && it->first.prefix_hash == prefix_hash) {
@@ -206,6 +212,9 @@ bool NativeModuleCache::GetStreamingCompilationOwnership(size_t prefix_hash) {
 }
 
 void NativeModuleCache::StreamingCompilationFailed(size_t prefix_hash) {
+  // Temporarily disabled to fix stability issue on M-81
+  // (https://crbug.com/1070199).
+  if (!FLAG_future) return;
   base::MutexGuard lock(&mutex_);
   Key key{prefix_hash, {}};
   DCHECK_EQ(1, map_.count(key));
@@ -217,6 +226,9 @@ std::shared_ptr<NativeModule> NativeModuleCache::Update(
     std::shared_ptr<NativeModule> native_module, bool error) {
   DCHECK_NOT_NULL(native_module);
   if (native_module->module()->origin != kWasmOrigin) return native_module;
+  // Temporarily disabled to fix stability issue on M-81
+  // (https://crbug.com/1070199).
+  if (!FLAG_future) return native_module;
   Vector<const uint8_t> wire_bytes = native_module->wire_bytes();
   DCHECK(!wire_bytes.empty());
   size_t prefix_hash = PrefixHash(native_module->wire_bytes());

test/cctest/cctest.status

@@ -618,4 +618,11 @@
   'test-cpu-profiler/DeoptUntrackedFunction': [SKIP],
 }],  # variant == turboprop
 
+##############################################################################
+['variant != future', {
+  # Wasm native module cache is temporarily disabled in non-future variant
+  # (https://crbug.com/1070199)
+  'test-compilation-cache/*': [SKIP]
+}],  # variant != future
+
 ]

test/inspector/inspector.status

@@ -87,5 +87,11 @@
 }],  # 'arch == s390 or arch == s390x'
 
 ##############################################################################
+['variant != future', {
+  # Wasm native module cache is temporarily disabled in non-future variant
+  # (https://crbug.com/1070199)
+  'debugger/wasm-scripts': [SKIP],
+}],  # variant != future
+
 
 ]