Adding a few more EH tests to Regression/C++

Adding a few more corner cases to EH testing, all passing on both
x86_64 and ARM. If this breaks any other architecture, feel free to
revert and open a bug in bugzilla.



git-svn-id: https://llvm.org/svn/llvm-project/test-suite/trunk@203860 91177308-0d34-0410-b5e6-96231b3b80d8