Update prebuilt Clang to r416183b from Android.

https://android.googlesource.com/platform/prebuilts/clang/host/
linux-x86/+/06a71ddac05c22edb2d10b590e1769b3f8619bef

clang 12.0.5 (based on r416183b) from build 7284624.

Change-Id: I277a316abcf47307562d8b748b84870f31a72866
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/linux-x64/clang/include/lldb/Utility/StringExtractor.h b/linux-x64/clang/include/lldb/Utility/StringExtractor.h
index f20ec92..6a5bb24 100644
--- a/linux-x64/clang/include/lldb/Utility/StringExtractor.h
+++ b/linux-x64/clang/include/lldb/Utility/StringExtractor.h
@@ -6,8 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef utility_StringExtractor_h_
-#define utility_StringExtractor_h_
+#ifndef LLDB_UTILITY_STRINGEXTRACTOR_H
+#define LLDB_UTILITY_STRINGEXTRACTOR_H
 
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/StringRef.h"
@@ -26,7 +26,7 @@
   virtual ~StringExtractor();
 
   void Reset(llvm::StringRef str) {
-    m_packet = str;
+    m_packet = std::string(str);
     m_index = 0;
   }
 
@@ -45,9 +45,7 @@
 
   void SkipSpaces();
 
-  std::string &GetStringRef() { return m_packet; }
-
-  const std::string &GetStringRef() const { return m_packet; }
+  llvm::StringRef GetStringRef() const { return m_packet; }
 
   bool Empty() { return m_packet.empty(); }
 
@@ -91,9 +89,6 @@
 
   size_t GetHexBytesAvail(llvm::MutableArrayRef<uint8_t> dest);
 
-  uint64_t GetHexWithFixedSize(uint32_t byte_size, bool little_endian,
-                               uint64_t fail_value);
-
   size_t GetHexByteString(std::string &str);
 
   size_t GetHexByteStringFixedLength(std::string &str, uint32_t nibble_length);
@@ -113,12 +108,14 @@
     m_index = UINT64_MAX;
     return false;
   }
-  // For StringExtractor only
-  std::string m_packet; // The string in which to extract data.
-  uint64_t m_index;     // When extracting data from a packet, this index
-                        // will march along as things get extracted. If set to
-                        // UINT64_MAX the end of the packet data was reached
-                        // when decoding information
+
+  /// The string in which to extract data.
+  std::string m_packet;
+
+  /// When extracting data from a packet, this index will march along as things
+  /// get extracted. If set to UINT64_MAX the end of the packet data was
+  /// reached when decoding information.
+  uint64_t m_index;
 };
 
-#endif // utility_StringExtractor_h_
+#endif // LLDB_UTILITY_STRINGEXTRACTOR_H