[sanitizer_common][test] Disable FastUnwindTest.* on SPARC

Many of the `FastUnwindTest.*` tests `FAIL` on SPARC, both Solaris and
Linux.  The issue is that the fake stacks used in those tests don't match
the requirements of the SPARC unwinder in `sanitizer_stacktrace_sparc.cpp`
which has to look at the register window save area.

I'm disabling the failing tests.

Tested on `sparcv9-sun-solaris2.11`.
Differential Revision: https://reviews.llvm.org/D91618