[NFC] include cstdint prior to using uint8_t

[thanm]

Summary

include proper header prior to use of uint8_t typedef.

[cherry]

LGTM. Thanks.

[thanm]

Add include of <string> as well, also needed.

llvm/include/llvm/Demangle/MicrosoftDemangleNodes.h

 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_SUPPORT_MICROSOFTDEMANGLENODES_H
 #define LLVM_SUPPORT_MICROSOFTDEMANGLENODES_H
 
 #include "llvm/Demangle/DemangleConfig.h"
 #include "llvm/Demangle/StringView.h"
 #include <array>
+#include <cstdint>
 
 namespace llvm {
 namespace itanium_demangle {
 class OutputStream;
 }
 }
 
 using llvm::itanium_demangle::OutputStream;