[regexp] remove some dead code.

src/regexp/regexp-macro-assembler-tracer.cc

Index: src/regexp/regexp-macro-assembler-tracer.cc
diff --git a/src/regexp/regexp-macro-assembler-tracer.cc b/src/regexp/regexp-macro-assembler-tracer.cc
index 661df7470b35f994eeb35d988853a8aa72305ff2..5301ead69bdf02af8abc80639c10d8f3f87cbbed 100644
--- a/src/regexp/regexp-macro-assembler-tracer.cc
+++ b/src/regexp/regexp-macro-assembler-tracer.cc
@@ -369,6 +369,14 @@ void RegExpMacroAssemblerTracer::CheckNotBackReferenceIgnoreCase(
 }
 
 
+void RegExpMacroAssemblerTracer::CheckPosition(int cp_offset,
+                                               Label* on_outside_input) {
+  PrintF(" CheckPosition(cp_offset=%d, label[%08x]);\n", cp_offset,
+         LabelToInt(on_outside_input));
+  assembler_->CheckPosition(cp_offset, on_outside_input);
+}
+
+
 bool RegExpMacroAssemblerTracer::CheckSpecialCharacterClass(
     uc16 type,
     Label* on_no_match) {