Make helper functions static to avoid accidental collision and potentially aid optimization.

runtime/vm/intrinsifier_x64.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/intrinsifier.h"
 
 #include "vm/assembler.h"
@@ skipping 1847 matching lines @@
   // RDI: Start address to copy from (untagged).
 
   __ Bind(&ok);
   __ ret();
 
   __ Bind(&fall_through);
 }
 
 
 // TODO(srdjan): Add combinations (one-byte/two-byte/external strings).
-void StringEquality(Assembler* assembler, intptr_t string_cid) {
+static void StringEquality(Assembler* assembler, intptr_t string_cid) {
   Label fall_through, is_true, is_false, loop;
   __ movq(RAX, Address(RSP, + 2 * kWordSize));  // This.
   __ movq(RCX, Address(RSP, + 1 * kWordSize));  // Other.
 
   // Are identical?
   __ cmpq(RAX, RCX);
   __ j(EQUAL, &is_true, Assembler::kNearJump);
 
   // Is other OneByteString?
   __ testq(RCX, Immediate(kSmiTagMask));
@@ skipping 130 matching lines @@
   // Set return value to Isolate::current_tag_.
   __ movq(RAX, Address(RBX, Isolate::current_tag_offset()));
   __ ret();
 }
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64