Fix unquickening in the presence of duplicate methods.

The code item may have already been unquicken.

bug: 36059948
Test: 649-vdex-duplicate-method

(cherry picked from commit 095d6a6be5228ad734568892b820eaf18e549365)

Change-Id: If922c2c5f04d38449a11e0cfc1d81b2a09f2885b
4 files changed