Do not override register storing MethodType in invokeExact. am: 5ce388aa50 am: f0eae60b34

Original change: https://android-review.googlesource.com/c/platform/art/+/3551420

Change-Id: I9f7fe8300c873ca5b8c967324b77839f9165bc66
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>