Read a 64 bit varint as two JS numbers.
Returns tuple: [0]: low bits [1]: high bits
Copyright 2008 Google Inc. All rights reserved.
See https://github.com/protocolbuffers/protobuf/blob/8a71927d74a4ce34efe2d8769fda198f52d20d12/js/experimental/runtime/kernel/buffer_decoder.js#L175
Read a 64 bit varint as two JS numbers.
Returns tuple: [0]: low bits [1]: high bits
Copyright 2008 Google Inc. All rights reserved.
See https://github.com/protocolbuffers/protobuf/blob/8a71927d74a4ce34efe2d8769fda198f52d20d12/js/experimental/runtime/kernel/buffer_decoder.js#L175