JitRegister: Remove OProfile profiler

OProfile is not used at all these days, most major distributions do not ship it anymore (Debian, Fedora, and Alpine to name the few I've checked) and following a discussion on Discord, nobody is apparently using it, most devs not even being aware of it. This removes an optional dependency from Dolphin.

Source/Core/Common/CMakeLists.txt

@@ -350,10 +350,6 @@ if(USE_UPNP)
   target_link_libraries(common PRIVATE Miniupnpc::miniupnpc)
 endif()
 
-if(OPROFILE_FOUND)
-  target_link_libraries(common PRIVATE OProfile::OProfile)
-endif()
-
 if(ENABLE_LLVM)
   find_package(LLVM CONFIG)
   if(LLVM_FOUND)

Source/Core/Common/JitRegister.cpp

@@ -21,19 +21,11 @@
 #include <unistd.h>
 #endif
 
-#if defined USE_OPROFILE && USE_OPROFILE
-#include <opagent.h>
-#endif
-
 #if defined USE_VTUNE
 #include <jitprofiling.h>
 #pragma comment(lib, "jitprofiling.lib")
 #endif
 
-#if defined USE_OPROFILE && USE_OPROFILE
-static op_agent_t s_agent = nullptr;
-#endif
-
 static File::IOFile s_perf_map_file;
 
 namespace Common::JitRegister
@@ -42,11 +34,6 @@ static bool s_is_enabled = false;
 
 void Init(const std::string& perf_dir)
 {
-#if defined USE_OPROFILE && USE_OPROFILE
-  s_agent = op_open_agent();
-  s_is_enabled = true;
-#endif
-
   if (!perf_dir.empty() || getenv("PERF_BUILDID_DIR"))
   {
     const std::string dir = perf_dir.empty() ? "/tmp" : perf_dir;
@@ -61,11 +48,6 @@ void Init(const std::string& perf_dir)
 
 void Shutdown()
 {
-#if defined USE_OPROFILE && USE_OPROFILE
-  op_close_agent(s_agent);
-  s_agent = nullptr;
-#endif
-
 #ifdef USE_VTUNE
   iJIT_NotifyEvent(iJVM_EVENT_TYPE_SHUTDOWN, nullptr);
 #endif
@@ -83,15 +65,11 @@ bool IsEnabled()
 
 void Register(const void* base_address, u32 code_size, const std::string& symbol_name)
 {
-#if !(defined USE_OPROFILE && USE_OPROFILE) && !defined(USE_VTUNE)
+#ifndef USE_VTUNE
   if (!s_perf_map_file.IsOpen())
     return;
 #endif
 
-#if defined USE_OPROFILE && USE_OPROFILE
-  op_write_native_code(s_agent, symbol_name.c_str(), (u64)base_address, base_address, code_size);
-#endif
-
 #ifdef USE_VTUNE
   iJIT_Method_Load jmethod = {0};
   jmethod.method_id = iJIT_GetNewMethodID();