Check LocalInfo descriptor for nullptr in dexlayout.

Bug: 36966414
Test: mm test-art-host-gtest-dexlayout_test

(cherry-picked from commit d9be768f6e7f6787bce27b2ec4e1c3736218495a)

Change-Id: I1b9b2f66c6f728ee4ff99b70a2067620a0458fba
2 files changed