Core/Analytics: Use std::string_view where applicable

In these cases, the strings are treated as views anyways, so we can use
them here to avoid potential allocations.

Source/Core/Core/Analytics.cpp

@@ -101,11 +101,11 @@ void DolphinAnalytics::GenerateNewIdentity()
   SConfig::GetInstance().SaveSettings();
 }
 
-std::string DolphinAnalytics::MakeUniqueId(const std::string& data)
+std::string DolphinAnalytics::MakeUniqueId(std::string_view data)
 {
-  u8 digest[20];
-  std::string input = m_unique_id + data;
-  mbedtls_sha1(reinterpret_cast<const u8*>(input.c_str()), input.size(), digest);
+  std::array<u8, 20> digest;
+  const auto input = std::string{m_unique_id}.append(data);
+  mbedtls_sha1(reinterpret_cast<const u8*>(input.c_str()), input.size(), digest.data());
 
   // Convert to hex string and truncate to 64 bits.
   std::string out;
@@ -116,7 +116,7 @@ std::string DolphinAnalytics::MakeUniqueId(const std::string& data)
   return out;
 }
 
-void DolphinAnalytics::ReportDolphinStart(const std::string& ui_type)
+void DolphinAnalytics::ReportDolphinStart(std::string_view ui_type)
 {
   Common::AnalyticsReportBuilder builder(m_base_builder);
   builder.AddData("type", "dolphin-start");

Source/Core/Core/Analytics.h

@@ -8,6 +8,7 @@
 #include <memory>
 #include <mutex>
 #include <string>
+#include <string_view>
 #include <vector>
 
 #include "Common/Analytics.h"
@@ -49,7 +50,7 @@ public:
   void GenerateNewIdentity();
 
   // Reports a Dolphin start event.
-  void ReportDolphinStart(const std::string& ui_type);
+  void ReportDolphinStart(std::string_view ui_type);
 
   // Generates a base report for a "Game start" event. Also preseeds the
   // per-game base data.
@@ -88,7 +89,7 @@ private:
   // Returns a unique ID derived on the global unique ID, hashed with some
   // report-specific data. This avoid correlation between different types of
   // events.
-  std::string MakeUniqueId(const std::string& data);
+  std::string MakeUniqueId(std::string_view data);
 
   // Unique ID. This should never leave the application. Only used derived
   // values created by MakeUniqueId.