Remove duplicate declaration.

llvm-svn: 274429

lld/ELF/MarkLive.cpp

@@ -23,6 +23,7 @@
 #include "InputSection.h"
 #include "LinkerScript.h"
 #include "OutputSections.h"
+#include "Strings.h"
 #include "SymbolTable.h"
 #include "Symbols.h"
 #include "Target.h"

lld/ELF/OutputSections.h

@@ -40,8 +40,6 @@ template <class ELFT> class SharedFile;
 template <class ELFT> class SharedSymbol;
 template <class ELFT> class DefinedRegular;
 
-bool isValidCIdentifier(StringRef S);
-
 // This represents a section in an output file.
 // Different sub classes represent different types of sections. Some contain
 // input sections, others are created by the linker.