Revert "Remove ShadowFrame::dex_pc_ (but keep dex_pc_ptr_)"

This reverts commit 50bc8fb89c79874e731f245abda3b9e48a541cfe.

Reason for revert: Performance regression

Change-Id: Ib39ceb9e1f2753c518dd24fd193a824211fd5795
13 files changed