fix build and while at it remove a redudant include

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91774 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/X86DisassemblerShared.h b/utils/TableGen/X86DisassemblerShared.h
index 7fcd122..0417e9d 100644
--- a/utils/TableGen/X86DisassemblerShared.h
+++ b/utils/TableGen/X86DisassemblerShared.h
@@ -11,6 +11,7 @@
 #define X86DISASSEMBLERSHARED_H
 
 #include <string>
+#include <string.h>
 
 #define INSTRUCTION_SPECIFIER_FIELDS       \
   bool                    filtered;        \