ARM: clean up code now that ARMv6 is the baseline.

src/arm/constants-arm.h

Index: src/arm/constants-arm.h
diff --git a/src/arm/constants-arm.h b/src/arm/constants-arm.h
index 747dc5627a708de6d9d7a8ca6d8611f83280044f..e21055fee4bad7296523af9a4ec2f6674ee1219b 100644
--- a/src/arm/constants-arm.h
+++ b/src/arm/constants-arm.h
@@ -33,13 +33,6 @@
 #error ARM EABI support is required.
 #endif
 
-// This means that interwork-compatible jump instructions are generated.  We
-// want to generate them on the simulator too so it makes snapshots that can
-// be used on real hardware.
-#if defined(__THUMB_INTERWORK__) || !defined(__arm__)
-# define USE_THUMB_INTERWORK 1
-#endif
-
 #if defined(__ARM_ARCH_7A__) || \
     defined(__ARM_ARCH_7R__) || \
     defined(__ARM_ARCH_7__)
@@ -49,39 +42,11 @@
 #endif
 #endif
 
-#if defined(__ARM_ARCH_6__)   ||   \
-    defined(__ARM_ARCH_6J__)  ||  \
-    defined(__ARM_ARCH_6K__)  ||  \
-    defined(__ARM_ARCH_6Z__)  ||  \
-    defined(__ARM_ARCH_6ZK__) || \
-    defined(__ARM_ARCH_6T2__) || \
-    defined(CAN_USE_ARMV7_INSTRUCTIONS)
-# define CAN_USE_ARMV6_INSTRUCTIONS 1
-#endif
-
-#if defined(__ARM_ARCH_5__)    || \
-    defined(__ARM_ARCH_5T__)   || \
-    defined(__ARM_ARCH_5TE__)  || \
-    defined(__ARM_ARCH_5TEJ__) || \
-    defined(CAN_USE_ARMV6_INSTRUCTIONS)
-# define CAN_USE_ARMV5_INSTRUCTIONS 1
-# define CAN_USE_THUMB_INSTRUCTIONS 1
-#endif
-
-// Simulator should support ARM5 instructions and unaligned access by default.
+// Simulator should support unaligned access by default.
 #if !defined(__arm__)
-# define CAN_USE_ARMV5_INSTRUCTIONS 1
-# define CAN_USE_THUMB_INSTRUCTIONS 1
-
 # ifndef CAN_USE_UNALIGNED_ACCESSES
 #  define CAN_USE_UNALIGNED_ACCESSES 1
 # endif
-
-#endif
-
-// Using blx may yield better code, so use it when required or when available
-#if defined(USE_THUMB_INTERWORK) || defined(CAN_USE_ARMV5_INSTRUCTIONS)
-#define USE_BLX 1
 #endif
 
 namespace v8 {