The test ms-lookup-template-base-classes.cpp added in d972d4c749048531953a16b815e07c67e8455a3b
is failing on some builtbot that don't include x86.
This patch should fix that (following the patterns in the test directory).
This reverts commit efa9aaad703e6b150980ed1a74b4e7c9da7d85a2 and adds a
crash test.
The commit caused a crash in CodeGen with -fms-compatibility, see
https://bugs.llvm.org/show_bug.cgi?id=48690.