ARM: Add a bitfield to indicate if an immediate should be used.

src/arch/arm/isa/bitfields.isa

@@ -38,6 +38,7 @@ def bitfield ENCODING      encoding;
 def bitfield OPCODE        opcode;
 def bitfield MEDIA_OPCODE  mediaOpcode;
 def bitfield MEDIA_OPCODE2 mediaOpcode2;
+def bitfield USEIMM        useImm;
 def bitfield OPCODE_24	   opcode24;
 def bitfield OPCODE_23_20  opcode23_20;
 def bitfield OPCODE_23_21  opcode23_21;

src/arch/arm/types.hh

@@ -45,6 +45,7 @@ namespace ArmISA
 
         // All the different types of opcode fields.
         Bitfield<27, 25> encoding;
+        Bitfield<25>     useImm;
         Bitfield<24, 21> opcode;
         Bitfield<24, 20> mediaOpcode;
         Bitfield<24>     opcode24;