[lldb] Replace std::isprint/isspace with llvm's locale-independent version

Summary:
LLVM is using its own isPrint/isSpace implementation that doesn't change depending on the current locale. LLDB should do the same
to prevent that internal logic changes depending on the set locale.

Reviewers: JDevlieghere, labath, mib, totally_not_teemperor

Reviewed By: JDevlieghere

Differential Revision: https://reviews.llvm.org/D82175

lldb/source/Utility/StringExtractor.cpp

@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "lldb/Utility/StringExtractor.h"
+#include "llvm/ADT/StringExtras.h"
 
 #include <tuple>
 
@@ -365,6 +366,6 @@ bool StringExtractor::GetNameColonValue(llvm::StringRef &name,
 
 void StringExtractor::SkipSpaces() {
   const size_t n = m_packet.size();
-  while (m_index < n && isspace(m_packet[m_index]))
+  while (m_index < n && llvm::isSpace(m_packet[m_index]))
     ++m_index;
 }