[crankshaft] Fragmentation-free allocation folding.

src/arm/macro-assembler-arm.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ARM_MACRO_ASSEMBLER_ARM_H_
 #define V8_ARM_MACRO_ASSEMBLER_ARM_H_
 
 #include "src/assembler.h"
 #include "src/bailout-reason.h"
 #include "src/frames.h"
@@ skipping 765 matching lines @@
   void Allocate(int object_size,
                 Register result,
                 Register scratch1,
                 Register scratch2,
                 Label* gc_required,
                 AllocationFlags flags);
 
   void Allocate(Register object_size, Register result, Register result_end,
                 Register scratch, Label* gc_required, AllocationFlags flags);
 
+  // FastAllocate is right now only used for folded allocations. It just
+  // increments the top pointer without checking against limit. This can only
+  // be done if it was proved earlier that the allocation will succeed.
+  void FastAllocate(int object_size, Register result, Register scratch1,
+                    Register scratch2, AllocationFlags flags);
+
+  void FastAllocate(Register object_size, Register result, Register result_end,
+                    Register scratch, AllocationFlags flags);
+
   void AllocateTwoByteString(Register result,
                              Register length,
                              Register scratch1,
                              Register scratch2,
                              Register scratch3,
                              Label* gc_required);
   void AllocateOneByteString(Register result, Register length,
                              Register scratch1, Register scratch2,
                              Register scratch3, Label* gc_required);
   void AllocateTwoByteConsString(Register result,
@@ skipping 774 matching lines @@
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ARM_MACRO_ASSEMBLER_ARM_H_