Revert^2 "Enable String compression."

Test: m test-art-host (interpreter, JIT, AOT)
Test: m test-art-target on Nexus 6P (interpreter, JIT, AOT)
Test: Nexus 6P boots
Test: m ahat-test
Bug: 31040547

This reverts commit 979bc3192ec23db4d06977d59fed28f41ae1c174.

Change-Id: I31840806dd71b6aedd0ec7c8e627a6fa06d95bdf
1 file changed