Make nrvo-string test more robust.

The breakpoint locations were in places where clang doesn't actually
emit a source location for and depend on the debugger's ability to
move the breakpoint forward onto a line that is already in the
function epilogue. In my testing older versions of LLDB fail to do
that, so I'm modifying the test to force a break-able location by
calling a noinline function.

<rdar://problem/52079841>

llvm-svn: 364466
GitOrigin-RevId: 8ac899c6003cba58162161cc07c5c5e2f0da5194
1 file changed