fix [2931718] glDrawArrays skips a triangle when more than 70 vertices are used.
fix [2931718] glDrawArrays skips a triangle when more than 70 vertices are used.

a typo prevented the last 2 vertices of a batch to be copied to the front of
the next batch. Instead, the 2 very first vertices were used.

Change-Id: I3c344784dac1cef64df2fb6f6efb2f901cc788db

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base