MIPS: Use the Lsa() macro/r6 instruction in existing code.

src/ic/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.
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/codegen.h"
 #include "src/ic/ic.h"
 #include "src/ic/stub-cache.h"
 #include "src/interface-descriptors.h"
@@ skipping 24 matching lines @@
   DCHECK((value_off_addr - key_off_addr) < (256 * 4));
   DCHECK(map_off_addr > key_off_addr);
   DCHECK((map_off_addr - key_off_addr) % 4 == 0);
   DCHECK((map_off_addr - key_off_addr) < (256 * 4));
 
   Label miss;
   Register base_addr = scratch;
   scratch = no_reg;
 
   // Multiply by 3 because there are 3 fields per entry (name, code, map).
-  __ sll(offset_scratch, offset, 1);
-  __ Addu(offset_scratch, offset_scratch, offset);
+  __ Lsa(offset_scratch, offset, offset, 1);
 
   // Calculate the base address of the entry.
   __ li(base_addr, Operand(key_offset));
-  __ sll(at, offset_scratch, kPointerSizeLog2);
-  __ Addu(base_addr, base_addr, at);
+  __ Lsa(base_addr, base_addr, offset_scratch, kPointerSizeLog2);
 
   // Check that the key in the entry matches the name.
   __ lw(at, MemOperand(base_addr, 0));
   __ Branch(&miss, ne, name, Operand(at));
 
   // Check the map matches.
   __ lw(at, MemOperand(base_addr, map_off_addr - key_off_addr));
   __ lw(scratch2, FieldMemOperand(receiver, HeapObject::kMapOffset));
   __ Branch(&miss, ne, at, Operand(scratch2));
 
@@ skipping 105 matching lines @@
   __ IncrementCounter(counters->megamorphic_stub_cache_misses(), 1, extra2,
                       extra3);
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS