Unravel kHeapObjectTagSize from the stub cache.

src/mips/stub-cache-mips.cc

 // 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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/codegen.h"
 #include "src/ic-inl.h"
@@ skipping 178 matching lines @@
   // Check that the receiver isn't a smi.
   __ JumpIfSmi(receiver, &miss);
 
   // Get the map of the receiver and compute the hash.
   __ lw(scratch, FieldMemOperand(name, Name::kHashFieldOffset));
   __ lw(at, FieldMemOperand(receiver, HeapObject::kMapOffset));
   __ Addu(scratch, scratch, at);
   uint32_t mask = kPrimaryTableSize - 1;
   // We shift out the last two bits because they are not part of the hash and
   // they are always 01 for maps.
-  __ srl(scratch, scratch, kHeapObjectTagSize);
-  __ Xor(scratch, scratch, Operand((flags >> kHeapObjectTagSize) & mask));
+  __ srl(scratch, scratch, kCacheIndexShift);
+  __ Xor(scratch, scratch, Operand((flags >> kCacheIndexShift) & mask));
   __ And(scratch, scratch, Operand(mask));
 
   // Probe the primary table.
   ProbeTable(isolate,
              masm,
              flags,
              kPrimary,
              receiver,
              name,
              scratch,
              extra,
              extra2,
              extra3);
 
   // Primary miss: Compute hash for secondary probe.
-  __ srl(at, name, kHeapObjectTagSize);
+  __ srl(at, name, kCacheIndexShift);
   __ Subu(scratch, scratch, at);
   uint32_t mask2 = kSecondaryTableSize - 1;
-  __ Addu(scratch, scratch, Operand((flags >> kHeapObjectTagSize) & mask2));
+  __ Addu(scratch, scratch, Operand((flags >> kCacheIndexShift) & mask2));
   __ And(scratch, scratch, Operand(mask2));
 
   // Probe the secondary table.
   ProbeTable(isolate,
              masm,
              flags,
              kSecondary,
              receiver,
              name,
              scratch,
@@ skipping 1268 matching lines @@
 
   TailCallBuiltin(masm, Builtins::kKeyedLoadIC_Miss);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS