Upgrade v8 to 3.6.6.20

deps/v8/SConstruct

@@ -288,6 +288,7 @@ V8_EXTRA_FLAGS = {
   'gcc': {
     'all': {
       'WARNINGFLAGS': ['-Wall',
+                       '-Werror',
                        '-W',
                        '-Wno-unused-parameter',
                        '-Wnon-virtual-dtor']
@@ -381,7 +382,7 @@ MKSNAPSHOT_EXTRA_FLAGS = {
 DTOA_EXTRA_FLAGS = {
   'gcc': {
     'all': {
-      'WARNINGFLAGS': ['-Wno-uninitialized'],
+      'WARNINGFLAGS': ['-Werror', '-Wno-uninitialized'],
       'CCFLAGS': GCC_DTOA_EXTRA_CCFLAGS
     }
   },

deps/v8/src/heap.cc

@@ -563,7 +563,9 @@ void Heap::ReserveSpace(
   PagedSpace* cell_space = Heap::cell_space();
   LargeObjectSpace* lo_space = Heap::lo_space();
   bool gc_performed = true;
-  while (gc_performed) {
+  int counter = 0;
+  static const int kThreshold = 20;
+  while (gc_performed && counter++ < kThreshold) {
     gc_performed = false;
     if (!new_space->ReserveSpace(new_space_size)) {
       Heap::CollectGarbage(NEW_SPACE);
@@ -602,6 +604,11 @@ void Heap::ReserveSpace(
       gc_performed = true;
     }
   }
+
+  if (gc_performed) {
+    // Failed to reserve the space after several attempts.
+    V8::FatalProcessOutOfMemory("Heap::ReserveSpace");
+  }
 }
 
 

deps/v8/src/version.cc

@@ -35,7 +35,7 @@
 #define MAJOR_VERSION     3
 #define MINOR_VERSION     6
 #define BUILD_NUMBER      6
-#define PATCH_LEVEL       19
+#define PATCH_LEVEL       20
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)
 #define IS_CANDIDATE_VERSION 0