Enable optimizer pipeline for DBC.

runtime/vm/disassembler_dbc.cc

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/disassembler.h"
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_DBC.
 #if defined(TARGET_ARCH_DBC)
 
 #include "platform/assert.h"
@@ skipping 45 matching lines @@
   FormatOperand(buf, size, "k%d", value);
 }
 
 
 static void Fmtreg(char** buf, intptr_t* size, uword pc, int32_t value) {
   FormatOperand(buf, size, "r%d", value);
 }
 
 
 static void Fmtxeg(char** buf, intptr_t* size, uword pc, int32_t value) {
-  FormatOperand(buf, size, "R(%d)", value);
+  if (value < 0) {
+    FormatOperand(buf, size, "FP[%d]", value);
+  } else {
+    Fmtreg(buf, size, pc, value);
+  }
 }
 
 
 static void Fmtnum(char** buf, intptr_t* size, uword pc, int32_t value) {
   FormatOperand(buf, size, "#%d", value);
 }
 
 
 static void Apply(char** buf,
                   intptr_t* size,
@@ skipping 147 matching lines @@
   OS::SNPrint(hex_buffer, hex_size, "%08x", instr);
   if (out_instr_size) {
     *out_instr_size = sizeof(uint32_t);
   }
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_DBC