[cfi] Disable thinlto tests on Darwin.

These were added in r301016, but they're failing, because
-fsanitize=cfi seemingly causes -flto=thin to emit raw bitcode objects,
rather than the mach-o-wrapped bitcode we emit with -flto=thin alone.

That causes all tests to fail with ld64 errors.

Filed PR32741.

llvm-svn: 301065

compiler-rt/test/cfi/CMakeLists.txt

@@ -31,7 +31,6 @@ endmacro()
 
 if (APPLE)
   add_cfi_test_suites(False False)
-  add_cfi_test_suites(False True)
 elseif(WINDOWS)
   add_cfi_test_suites(True False)
   add_cfi_test_suites(True True)