shader: Add shader loop safety check settings

Also add a setting for enable Nsight Aftermath.

src/shader_recompiler/frontend/ir/ir_emitter.h

@@ -55,6 +55,9 @@ public:
     [[nodiscard]] U32 GetIndirectBranchVariable();
     void SetIndirectBranchVariable(const U32& value);
 
+    [[nodiscard]] U32 GetLoopSafetyVariable(u32 id);
+    void SetLoopSafetyVariable(u32 id, const U32& counter);
+
     [[nodiscard]] U32 GetCbuf(const U32& binding, const U32& byte_offset);
     [[nodiscard]] Value GetCbuf(const U32& binding, const U32& byte_offset, size_t bitsize,
                                 bool is_signed);