mark tests as failing on linux and windows

Author: charles-zablit

lldb/test/Shell/Swift/inlined-function-name-backtrace.test

@@ -1,5 +1,6 @@
 # Test Swift function name printing in backtraces.
 
+# XFAIL: !system-darwin
 # RUN: split-file %s %t
 # RUN: %target-swiftc -g -O %t/main.swift -o %t.out
 # RUN: %lldb -x -b -s %t/commands.input %t.out -o exit 2>&1 \