Move most of runtime/base to libartbase/base

Enforce the layering that code in runtime/base should not depend on
runtime by separating it into libartbase.  Some of the code in
runtime/base depends on the Runtime class, so it cannot be moved yet.
Also, some of the tests depend on CommonRuntimeTest, which itself needs
to be factored (in a subsequent CL).

Bug: 22322814
Test: make -j 50 checkbuild
      make -j 50 test-art-host

Change-Id: I8b096c1e2542f829eb456b4b057c71421b77d7e2
diff --git a/runtime/signal_catcher.cc b/runtime/signal_catcher.cc
index 9c3afbb..d590ad5 100644
--- a/runtime/signal_catcher.cc
+++ b/runtime/signal_catcher.cc
@@ -36,18 +36,18 @@
 #include "arch/instruction_set.h"
 #include "base/file_utils.h"
 #include "base/logging.h"  // For GetCmdLine.
+#include "base/os.h"
 #include "base/time_utils.h"
 #include "base/unix_file/fd_file.h"
+#include "base/utils.h"
 #include "class_linker.h"
 #include "gc/heap.h"
 #include "jit/profile_saver.h"
-#include "os.h"
 #include "runtime.h"
 #include "scoped_thread_state_change-inl.h"
 #include "signal_set.h"
 #include "thread.h"
 #include "thread_list.h"
-#include "utils.h"
 
 namespace art {