Revert "Add hand written assembly for mterp field reads."

This reverts commit 07559e2c.

Reason for revert: Breaks poisoning + debuggable:
https://build.chromium.org/p/client.art/builders/volantis-armv8-poison-ndebug/builds/2105/steps/test%20optimizing/logs/stdio

Change-Id: I6bb9bd083ca723e347b6047eac7216667a2f771b