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/compiler/utils/assembler.h b/compiler/utils/assembler.h
index ad7e98d..67711e3 100644
--- a/compiler/utils/assembler.h
+++ b/compiler/utils/assembler.h
@@ -19,16 +19,16 @@
 
 #include <vector>
 
+#include "arch/instruction_set.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "arm/constants_arm.h"
-#include "mips/constants_mips.h"
-#include "x86/constants_x86.h"
-#include "x86_64/constants_x86_64.h"
-#include "instruction_set.h"
 #include "managed_register.h"
 #include "memory_region.h"
+#include "mips/constants_mips.h"
 #include "offsets.h"
+#include "x86/constants_x86.h"
+#include "x86_64/constants_x86_64.h"
 
 namespace art {
 
diff --git a/compiler/utils/stack_checks.h b/compiler/utils/stack_checks.h
index e762f7d..c348f2c 100644
--- a/compiler/utils/stack_checks.h
+++ b/compiler/utils/stack_checks.h
@@ -17,7 +17,7 @@
 #ifndef ART_COMPILER_UTILS_STACK_CHECKS_H_
 #define ART_COMPILER_UTILS_STACK_CHECKS_H_
 
-#include "instruction_set.h"
+#include "arch/instruction_set.h"
 
 namespace art {
 
@@ -34,8 +34,7 @@
 // stack overflow check on method entry.
 //
 // A frame is considered large when it's above kLargeFrameSize.
-static inline bool FrameNeedsStackCheck(size_t size, InstructionSet isa) {
-  UNUSED(isa);
+static inline bool FrameNeedsStackCheck(size_t size, InstructionSet isa ATTRIBUTE_UNUSED) {
   return size >= kLargeFrameSize;
 }