buffer: use Utf8LengthV2() instead of Utf8Length()

buffer: use Utf8LengthV2() instead of Utf8Length() · nodejs/node@8b5ada4

Original file line number	Diff line number	Diff line change
`@@ -742,7 +742,7 @@ uint32_t FastByteLengthUtf8(`
`742`	`742`	`Local<String> sourceStr = sourceValue.As<String>();`
`743`	`743`
`744`	`744`	`if (!sourceStr->IsExternalOneByte()) {`
`745`		`-return sourceStr->Utf8Length(isolate);`
	`745`	`+return sourceStr->Utf8LengthV2(isolate);`
`746`	`746`	`}`
`747`	`747`	`auto source = sourceStr->GetExternalOneByteStringResource();`
`748`	`748`	`// For short inputs, the function call overhead to simdutf is maybe`