diff --git a/tools/v8_gypfiles/features.gypi b/tools/v8_gypfiles/features.gypi
index 4cf4b9332d754e..6a9ddb7b3a32bb 100644
--- a/tools/v8_gypfiles/features.gypi
+++ b/tools/v8_gypfiles/features.gypi
@@ -270,6 +270,9 @@
     # Allow for JS promise hooks (instead of just C++).
     'v8_enable_javascript_promise_hooks%': 0,
 
+    # Allow for JS promise hooks (instead of just C++).
+    'v8_enable_continuation_preserved_embedder_data%': 1,
+
     # Enable allocation folding globally (sets -dV8_ALLOCATION_FOLDING).
     # When it's disabled, the --turbo-allocation-folding runtime flag will be ignored.
     'v8_enable_allocation_folding%': 1,
@@ -522,6 +525,9 @@
       ['v8_enable_javascript_promise_hooks==1', {
         'defines': ['V8_ENABLE_JAVASCRIPT_PROMISE_HOOKS',],
       }],
+      ['v8_enable_continuation_preserved_embedder_data==1', {
+        'defines': ['V8_ENABLE_CONTINUATION_PRESERVED_EMBEDDER_DATA',],
+      }],
       ['v8_enable_allocation_folding==1', {
         'defines': ['V8_ALLOCATION_FOLDING',],
       }],
diff --git a/tools/v8_gypfiles/v8.gyp b/tools/v8_gypfiles/v8.gyp
index bfd3766d3b25a7..4f843591093269 100644
--- a/tools/v8_gypfiles/v8.gyp
+++ b/tools/v8_gypfiles/v8.gyp
@@ -336,12 +336,12 @@
           'sources': [
             '<(V8_ROOT)/src/builtins/riscv/builtins-riscv.cc',
           ],
-        }],        
+        }],
         ['v8_target_arch=="loong64" or v8_target_arch=="loong64"', {
           'sources': [
             '<(V8_ROOT)/src/builtins/loong64/builtins-loong64.cc',
           ],
-        }],        
+        }],
         ['v8_target_arch=="mips64" or v8_target_arch=="mips64el"', {
           'sources': [
             '<(V8_ROOT)/src/builtins/mips64/builtins-mips64.cc',
@@ -425,6 +425,7 @@
           'variables': {
             'mksnapshot_flags': [
               '--turbo_instruction_scheduling',
+              '--stress-turbo-late-spilling',
               # In cross builds, the snapshot may be generated for both the host and
               # target toolchains.  The same host binary is used to generate both, so
               # mksnapshot needs to know which target OS to use at runtime.  It's weird,
@@ -1124,7 +1125,7 @@
           'sources': [
             '<!@pymod_do_main(GN-scraper "<(V8_ROOT)/BUILD.gn"  "\\"v8_base_without_compiler.*?v8_enable_wasm_gdb_remote_debugging.*?v8_current_cpu == \\"riscv64\\".*?sources \\+= ")',
           ],
-        }],        
+        }],
         ['v8_target_arch=="loong64"', {
           'sources': [
             '<!@pymod_do_main(GN-scraper "<(V8_ROOT)/BUILD.gn"  "\\"v8_base_without_compiler.*?v8_enable_wasm_gdb_remote_debugging.*?v8_current_cpu == \\"loong64\\".*?sources \\+= ")',
@@ -1141,7 +1142,7 @@
               ],
             }],
           ],
-        }],        
+        }],
         ['OS=="win"', {
           # This will prevent V8's .cc files conflicting with the inspector's
           # .cpp files in the same shard.