Game crashing at start up apparently since upgrade to 1.10.2

Put the summary of the bug you're having here

The game will not start up. A Minecraft Crash Report is displayed:

java.lang.OutofmemoryError: Java heap space

What I expected to happen was...:
Describe what you thought should happen here
The game to start up

What actually happened was...:
The game would not start up and the above error report was displayed
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...