[stubs] Remove dead string copying code

src/arm/code-stubs-arm.cc

Index: src/arm/code-stubs-arm.cc
diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
index 08b31ea907368d61621a0b3242354ff58cf29368..336e67a5ef141df0945fda8c6def0b81e2168dd6 100644
--- a/src/arm/code-stubs-arm.cc
+++ b/src/arm/code-stubs-arm.cc
@@ -2064,46 +2064,6 @@ void StringCharFromCodeGenerator::GenerateSlow(
   __ 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.
-    __ tst(dest, Operand(kPointerAlignmentMask));
-    __ Check(eq, kDestinationOfCopyNotAligned);
-  }
-
-  // Assumes word reads and writes are little endian.
-  // Nothing to do for zero characters.
-  Label done;
-  if (encoding == String::TWO_BYTE_ENCODING) {
-    __ add(count, count, Operand(count), SetCC);
-  }
-
-  Register limit = count;  // Read until dest equals this.
-  __ add(limit, dest, Operand(count));
-
-  Label loop_entry, loop;
-  // Copy bytes from src to dest until dest hits limit.
-  __ b(&loop_entry);
-  __ bind(&loop);
-  __ ldrb(scratch, MemOperand(src, 1, PostIndex), lt);
-  __ strb(scratch, MemOperand(dest, 1, PostIndex));
-  __ bind(&loop_entry);
-  __ cmp(dest, Operand(limit));
-  __ b(lt, &loop);
-
-  __ bind(&done);
-}
-
-
 void StringHelper::GenerateFlatOneByteStringEquals(
     MacroAssembler* masm, Register left, Register right, Register scratch1,
     Register scratch2, Register scratch3) {