Instruction set features for ARM64, MIPS and X86.

Also, refactor how feature strings are handled so they are additive or
subtractive.
Make MIPS have features for FPU 32-bit and MIPS v2. Use in the quick compiler
rather than #ifdefs that wouldn't have worked in cross-compilation.
Add SIMD features for x86/x86-64 proposed in:
  https://android-review.googlesource.com/#/c/112370/

Bug: 18056890

Change-Id: Ic88ff84a714926bd277beb74a430c5c7d5ed7666
diff --git a/runtime/runtime.h b/runtime/runtime.h
index 3cbe1e5..39fd910 100644
--- a/runtime/runtime.h
+++ b/runtime/runtime.h
@@ -26,11 +26,11 @@
 #include <utility>
 #include <vector>
 
+#include "arch/instruction_set.h"
 #include "base/allocator.h"
 #include "compiler_callbacks.h"
 #include "gc_root.h"
 #include "instrumentation.h"
-#include "instruction_set.h"
 #include "jobject_comparator.h"
 #include "object_callbacks.h"
 #include "offsets.h"