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/stack.h b/runtime/stack.h
index 66c840d..1d772e6 100644
--- a/runtime/stack.h
+++ b/runtime/stack.h
@@ -20,8 +20,8 @@
 #include <stdint.h>
 #include <string>
 
+#include "arch/instruction_set.h"
 #include "dex_file.h"
-#include "instruction_set.h"
 #include "mirror/object_reference.h"
 #include "throw_location.h"
 #include "utils.h"