AArch64/GISel: Fix a couple of tests that were testing the wrong thing

Fix a couple of tests that were extending the wrong vreg, and
regenerate their checks with update_mir_test_checks. This looks like
it was a copy-paste or test update error.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@316087 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed