Fixing a performance bug introduced in r4581.

src/arm/codegen-arm.cc

 // Copyright 2010 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 8483 matching lines @@
   __ ldr(r3, FieldMemOperand(subject, String::kLengthOffset));
 
   // r2: Number of capture registers
   // r3: Length of subject string as a smi
   // subject: Subject string
   // regexp_data: RegExp data (FixedArray)
   // Check that the third argument is a positive smi less than the subject
   // string length. A negative value will be greater (unsigned comparison).
   __ ldr(r0, MemOperand(sp, kPreviousIndexOffset));
   __ tst(r0, Operand(kSmiTagMask));
-  __ b(eq, &runtime);
+  __ b(ne, &runtime);
   __ cmp(r3, Operand(r0));
-  __ b(le, &runtime);
+  __ b(ls, &runtime);
 
   // r2: Number of capture registers
   // subject: Subject string
   // regexp_data: RegExp data (FixedArray)
   // Check that the fourth object is a JSArray object.
   __ ldr(r0, MemOperand(sp, kLastMatchInfoOffset));
   __ tst(r0, Operand(kSmiTagMask));
   __ b(eq, &runtime);
   __ CompareObjectType(r0, r1, r1, JS_ARRAY_TYPE);
   __ b(ne, &runtime);
@@ skipping 1363 matching lines @@
 
   // Just jump to runtime to add the two strings.
   __ bind(&string_add_runtime);
   __ TailCallRuntime(Runtime::kStringAdd, 2, 1);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal