[SEH] Update SEH codegen tests to use the new IR

Also Fix a buglet where SEH tables had ranges that spanned funclets.

The remaining tests using the old landingpad IR are preparation tests,
and will be deleted along with the old preparation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@249917 91177308-0d34-0410-b5e6-96231b3b80d8
12 files changed