ARM backend support for pld (preload data) instruction

src/arm/constants-arm.h

Index: src/arm/constants-arm.h
===================================================================
--- src/arm/constants-arm.h	(revision 13713)
+++ src/arm/constants-arm.h	(working copy)
@@ -708,6 +708,15 @@
     return (TypeValue() == 7) && (Bit(24) == 1) && (SvcValue() >= kStopCode);
   }
 
+  // Test for a pld instruction
+  inline bool IsPld() const {
+    return (Bits(31, 28) == 15) &&
+        (Bits(27, 26) == 1) &&
+        (Bit(24) == 1) &&
+        (Bits(22, 20) == 5) &&
+        (Bits(15, 12) == 15);
+  }
+
   // Special accessors that test for existence of a value.
   inline bool HasS()    const { return SValue() == 1; }
   inline bool HasB()    const { return BValue() == 1; }