build: replace runtime flag with compiler option

V8 changed the typed array threshold option from a runtime flag to a
compile-time option.

Author: psmarshall

configure

@@ -1028,6 +1028,10 @@ def configure_v8(o):
   o['variables']['node_use_bundled_v8'] = b(not options.without_bundled_v8)
   o['variables']['force_dynamic_crt'] = 1 if options.shared else 0
   o['variables']['node_enable_d8'] = b(options.enable_d8)
+  # Unconditionally force typed arrays to allocate outside the v8 heap. This
+  # is to prevent memory pointers from being moved around that are returned by
+  # Buffer::Data().
+  o['variables']['v8_typed_array_max_size_in_heap'] = 0
   if options.enable_d8:
     o['variables']['test_isolation_mode'] = 'noop'  # Needed by d8.gyp.
   if options.without_bundled_v8 and options.enable_d8:

src/node.cc

@@ -4282,12 +4282,6 @@ void Init(int* argc,
   }
 #endif
 
-  // Unconditionally force typed arrays to allocate outside the v8 heap. This
-  // is to prevent memory pointers from being moved around that are returned by
-  // Buffer::Data().
-  const char no_typed_array_heap[] = "--typed_array_max_size_in_heap=0";
-  V8::SetFlagsFromString(no_typed_array_heap, sizeof(no_typed_array_heap) - 1);
-
   // We should set node_is_initialized here instead of in node::Start,
   // otherwise embedders using node::Init to initialize everything will not be
   // able to set it and native modules will not load for them.