Revert "Use a wider integer for the parser stack."

This reverts commit d1f7875c15a39b65b26af2dd068163ae5dd7c2c4.
It generated far more warnings than it fixed.

Change-Id: Iad6dfb2d3c371012c93e90333ef0ab207cc903c7
Merge topic 'parser-union-type' into master

0564cbbc Revert "Use a wider integer for the parser stack."