[stubs] Remove dead string copying code

src/ppc/code-stubs-ppc.cc

 // Copyright 2014 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_PPC
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 2141 matching lines @@
   call_helper.BeforeCall(masm);
   __ push(code_);
   __ CallRuntime(Runtime::kStringCharFromCode);
   __ Move(result_, r3);
   call_helper.AfterCall(masm);
   __ b(&exit_);
 
   __ Abort(kUnexpectedFallthroughFromCharFromCodeSlowCase);
 }
 
-
-enum CopyCharactersFlags { COPY_ONE_BYTE = 1, DEST_ALWAYS_ALIGNED = 2 };
-
-
-void StringHelper::GenerateCopyCharacters(MacroAssembler* masm, Register dest,
-                                          Register src, Register count,
-                                          Register scratch,
-                                          String::Encoding encoding) {
-  if (FLAG_debug_code) {
-    // Check that destination is word aligned.
-    __ andi(r0, dest, Operand(kPointerAlignmentMask));
-    __ Check(eq, kDestinationOfCopyNotAligned, cr0);
-  }
-
-  // Nothing to do for zero characters.
-  Label done;
-  if (encoding == String::TWO_BYTE_ENCODING) {
-    // double the length
-    __ add(count, count, count, LeaveOE, SetRC);
-    __ beq(&done, cr0);
-  } else {
-    __ cmpi(count, Operand::Zero());
-    __ beq(&done);
-  }
-
-  // Copy count bytes from src to dst.
-  Label byte_loop;
-  __ mtctr(count);
-  __ bind(&byte_loop);
-  __ lbz(scratch, MemOperand(src));
-  __ addi(src, src, Operand(1));
-  __ stb(scratch, MemOperand(dest));
-  __ addi(dest, dest, Operand(1));
-  __ bdnz(&byte_loop);
-
-  __ bind(&done);
-}
-
-
 void StringHelper::GenerateFlatOneByteStringEquals(MacroAssembler* masm,
                                                    Register left,
                                                    Register right,
                                                    Register scratch1,
                                                    Register scratch2) {
   Register length = scratch1;
 
   // Compare lengths.
   Label strings_not_equal, check_zero_length;
   __ LoadP(length, FieldMemOperand(left, String::kLengthOffset));
@@ skipping 2363 matching lines @@
       fp, (PropertyCallbackArguments::kReturnValueOffset + 3) * kPointerSize);
   CallApiFunctionAndReturn(masm, api_function_address, thunk_ref,
                            kStackUnwindSpace, NULL, return_value_operand, NULL);
 }
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC