Fix CodeGen/PowerPC/stack-protector.ll on OpenBSD
Fix CodeGen/PowerPC/stack-protector.ll on OpenBSD

On OpenBSD, the stack-smash protection transform uses "__guard_local"
and "__stack_smash_handler" instead of "__stack_chk_guard" and
"__stack_chk_fail".  However, CodeGen/PowerPC/stack-protector.ll
doesn't specify a target OS, so on OpenBSD it fails.

Add -mtriple=ppc32-unknown-linux to make the test host-OS agnostic. While
there, convert to FileCheck.

Patch by Matthew Dempsky.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@185206 91177308-0d34-0410-b5e6-96231b3b80d8

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