use ArrayBuffer->Data() when available

This is faster than accessing the BackingStore. API is available in V8 10.5+ per nodejs/node#32226 (comment) and was backported to Node.js v18.8.0 in nodejs/node@a0c5783.

Author: zbjornson

nan_typedarray_contents.h

@@ -31,9 +31,14 @@ class TypedArrayContents {
       v8::Local<v8::ArrayBuffer> buffer = array->Buffer();
 
       length = byte_length / sizeof(T);
+#if (V8_MAJOR_VERSION >= 10 ||                                                 \
+     (V8_MAJOR_VERSION == 10 &&                                                \
+      (defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 5)) ||                 \
+       (NODE_MAJOR_VERSION == 18 && NODE_MINOR_VERSION >= 8))
+      data = static_cast<char*>(buffer->Data()) + byte_offset;
 // Actually it's 7.9 here but this would lead to ABI issues with Node.js 13
 // using 7.8 till 13.2.0.
-#if (V8_MAJOR_VERSION >= 8)
+#elif (V8_MAJOR_VERSION >= 8)
       data = static_cast<char*>(buffer->GetBackingStore()->Data()) + byte_offset;
 #else
       data = static_cast<char*>(buffer->GetContents().Data()) + byte_offset;