Fix ahat parsing to allow leading whitespaces for comments

Test: atest ahat-tests:com.android.ahat.InstanceTest
Test: atest ahat-tests:com.android.ahat.ProguardMapTest
Bug: 215523729
Change-Id: I37e16065ba6e3d36e92d4de1e0a4c0efac2d03e6
2 files changed