video_core/macro_hle: Return unique_ptr directly from GetHLEProgram()

Same behavior, but less code and header dependencies.

src/video_core/macro/macro.cpp

@@ -65,10 +65,9 @@ void MacroEngine::Execute(u32 method, const std::vector<u32>& parameters) {
             cache_info.lle_program = Compile(code);
         }
 
-        auto hle_program = hle_macros->GetHLEProgram(cache_info.hash);
+        if (auto hle_program = hle_macros->GetHLEProgram(cache_info.hash)) {
-        if (hle_program.has_value()) {
             cache_info.has_hle_program = true;
-            cache_info.hle_program = std::move(hle_program.value());
+            cache_info.hle_program = std::move(hle_program);
             cache_info.hle_program->Execute(parameters, method);
         } else {
             cache_info.lle_program->Execute(parameters, method);

src/video_core/macro/macro_hle.cpp

@@ -105,11 +105,11 @@ private:
 HLEMacro::HLEMacro(Engines::Maxwell3D& maxwell3d_) : maxwell3d{maxwell3d_} {}
 HLEMacro::~HLEMacro() = default;
 
-std::optional<std::unique_ptr<CachedMacro>> HLEMacro::GetHLEProgram(u64 hash) const {
+std::unique_ptr<CachedMacro> HLEMacro::GetHLEProgram(u64 hash) const {
     const auto it = std::find_if(hle_funcs.cbegin(), hle_funcs.cend(),
                                  [hash](const auto& pair) { return pair.first == hash; });
     if (it == hle_funcs.end()) {
-        return std::nullopt;
+        return nullptr;
     }
     return std::make_unique<HLEMacroImpl>(maxwell3d, it->second);
 }

src/video_core/macro/macro_hle.h

@@ -5,7 +5,6 @@
 #pragma once
 
 #include <memory>
-#include <optional>
 #include "common/common_types.h"
 
 namespace Tegra {
@@ -19,7 +18,9 @@ public:
     explicit HLEMacro(Engines::Maxwell3D& maxwell3d_);
     ~HLEMacro();
 
-    std::optional<std::unique_ptr<CachedMacro>> GetHLEProgram(u64 hash) const;
+    // Allocates and returns a cached macro if the hash matches a known function.
+    // Returns nullptr otherwise.
+    [[nodiscard]] std::unique_ptr<CachedMacro> GetHLEProgram(u64 hash) const;
 
 private:
     Engines::Maxwell3D& maxwell3d;