deps: patch V8 to support compilation with MSVC

After enabling -std:c++20 on Windows, patch is now much smaller.

PR-URL: #52465
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Rafael Gonzaga <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>

Author: StefanStojanovic

common.gypi

@@ -37,7 +37,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.7',
+    'v8_embedder_string': '-node.8',
 
     ##### V8 defaults for Node.js #####
 
@@ -288,6 +288,8 @@
           '/Zc:__cplusplus',
           # The following option enables c++20 on Windows. This is needed for V8 v12.4+
           '-std:c++20',
+          # The following option reduces the "error C1060: compiler is out of heap space"
+          '/Zm2000',
         ],
         'BufferSecurityCheck': 'true',
         'DebugInformationFormat': 1,          # /Z7 embed info in .obj files

deps/v8/src/compiler/backend/instruction-selector-adapter.h

@@ -855,12 +855,13 @@ struct TurboshaftAdapter : public turboshaft::OperationMatcher {
           *traps_on_null = load_->kind.trap_on_null;
 #if V8_ENABLE_WEBASSEMBLY
         } else {
-          DCHECK((load_transform_ && !load_transform_->load_kind.trap_on_null)
 #if V8_ENABLE_WASM_SIMD256_REVEC
+          DCHECK((load_transform_ && !load_transform_->load_kind.trap_on_null)
                  || (load_transform256_ &&
-                     !load_transform256_->load_kind.trap_on_null)
+                     !load_transform256_->load_kind.trap_on_null));
+#else
+          DCHECK((load_transform_ && !load_transform_->load_kind.trap_on_null));
 #endif  // V8_ENABLE_WASM_SIMD256_REVEC
-          );
           *traps_on_null = false;
 #endif  // V8_ENABLE_WEBASSEMBLY
         }

deps/v8/src/objects/tagged-field.h

@@ -100,12 +100,10 @@ static_assert(sizeof(UnalignedDoubleMember) == sizeof(double));
 #define FLEXIBLE_ARRAY_MEMBER(Type, name)                     \
   using FlexibleDataReturnType = Type[0];                     \
   FlexibleDataReturnType& name() {                            \
-    static_assert(alignof(Type) <= alignof(decltype(*this))); \
     using ReturnType = Type[0];                               \
     return reinterpret_cast<ReturnType&>(*(this + 1));        \
   }                                                           \
   const FlexibleDataReturnType& name() const {                \
-    static_assert(alignof(Type) <= alignof(decltype(*this))); \
     using ReturnType = Type[0];                               \
     return reinterpret_cast<const ReturnType&>(*(this + 1));  \
   }                                                           \