[ASan] move swapcontext_test to Linux-specific tests

llvm-svn: 168513

diff --git a/compiler-rt/lib/asan/lit_tests/swapcontext_test.cc b/compiler-rt/lib/asan/lit_tests/Linux/swapcontext_test.cc
similarity index 100%
rename from compiler-rt/lib/asan/lit_tests/swapcontext_test.cc
rename to compiler-rt/lib/asan/lit_tests/Linux/swapcontext_test.cc