Abstract out fetching of break_address in debug mode

src/arm/assembler-arm-inl.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
 // are met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 440 matching lines @@
     return candidate;
   } else {
     candidate = pc - 3 * Assembler::kInstrSize;
     ASSERT(IsMovW(Memory::int32_at(candidate)) &&
            IsMovT(Memory::int32_at(candidate + kInstrSize)));
     return candidate;
   }
 }
 
 
+Address Assembler::break_address_from_return_address(Address pc) {
+  return pc - Assembler::kPatchDebugBreakSlotReturnOffset;
+}
+
+
 Address Assembler::return_address_from_call_start(Address pc) {
   if (IsLdrPcImmediateOffset(Memory::int32_at(pc)) |
       IsLdrPpImmediateOffset(Memory::int32_at(pc))) {
     // Load from constant pool, small section.
     return pc + kInstrSize * 2;
   } else {
     ASSERT(IsMovW(Memory::int32_at(pc)));
     ASSERT(IsMovT(Memory::int32_at(pc + kInstrSize)));
     if (IsLdrPpRegOffset(Memory::int32_at(pc + kInstrSize))) {
       // Load from constant pool, extended section.
@@ skipping 98 matching lines @@
     if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
       CpuFeatures::FlushICache(pc, 2 * kInstrSize);
     }
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_ASSEMBLER_ARM_INL_H_