Revert "GC triggering performance optimizations"

This reverts commit 10fda29764663c173c270f2c24e0f9dcbec6fa3f.
GC triggering performance optimizations

Copy the correct starting heap size at process init.
Interfaces to set GC/managed heap parameters.

Change-Id: If0b1637291e77f9781ae6249c5d0257f659253ca