Fixes PR37524.
The exception handling encodings for x86_64 in kernel code model
has been changed with r309884. Restore it to correct ones. These
encodings include PersonalityEncoding, LSDAEncoding and
TTypeEncoding.
Differential Revision: https://reviews.llvm.org/D50490
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@339534 91177308-0d34-0410-b5e6-96231b3b80d8