Use more std::span arguments

Source/Core/Common/Assembler/GekkoLexer.cpp

@@ -486,7 +486,7 @@ void Lexer::EatAndReset()
   SetIdentifierMatchRule(IdentifierMatchRule::Typical);
 }
 
-std::optional<std::string_view> Lexer::RunDfa(const std::vector<DfaNode>& dfa) const
+std::optional<std::string_view> Lexer::RunDfa(std::span<const DfaNode> dfa) const
 {
   size_t dfa_index = 0;
   bool transition_found;

Source/Core/Common/Assembler/GekkoLexer.h

@@ -7,6 +7,7 @@
 #include <array>
 #include <deque>
 #include <optional>
+#include <span>
 #include <string_view>
 #include <vector>
 
@@ -166,7 +167,7 @@ public:
   }
 
 private:
-  std::optional<std::string_view> RunDfa(const std::vector<DfaNode>& dfa) const;
+  std::optional<std::string_view> RunDfa(std::span<const DfaNode> dfa) const;
   void SkipWs() const;
   void FeedbackTokens() const;
   bool IdentifierHeadExtra(char h) const;