small misspelling fixes.

src/arm/lithium-codegen-arm.cc

 // Copyright 2012 the V8 project authors. 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2754 matching lines @@
   Register object = ToRegister(instr->value());
   Register temp = ToRegister(instr->temp());
   Register result = ToRegister(instr->result());
 
   ASSERT(object.is(r0));
   ASSERT(result.is(r0));
 
   // A Smi is not instance of anything.
   __ JumpIfSmi(object, &false_result);
 
-  // This is the inlined call site instanceof cache. The two occurences of the
+  // This is the inlined call site instanceof cache. The two occurrences of the
   // hole value will be patched to the last map/result pair generated by the
   // instanceof stub.
   Label cache_miss;
   Register map = temp;
   __ ldr(map, FieldMemOperand(object, HeapObject::kMapOffset));
   {
     // Block constant pool emission to ensure the positions of instructions are
     // as expected by the patcher. See InstanceofStub::Generate().
     Assembler::BlockConstPoolScope block_const_pool(masm());
     __ bind(deferred->map_check());  // Label for calculating code patching.
@@ skipping 3255 matching lines @@
   __ sub(scratch, result, Operand(index, LSL, kPointerSizeLog2 - kSmiTagSize));
   __ ldr(result, FieldMemOperand(scratch,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal