[dynarmic] remove dead-code interpreter (#3547)

interpreter was never called in practice and doesn't do anything other than just crash

Signed-off-by: lizzie <lizzie@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3547
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Reviewed-by: crueter <crueter@eden-emu.dev>
Reviewed-by: DraVee <dravee@eden-emu.dev>
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>

src/dynarmic/tests/A64/fibonacci.cpp

@@ -69,11 +69,6 @@ public:
         MemoryWrite64(vaddr + 8, value[1]);
     }
 
-    void InterpreterFallback(u64, size_t) override {
-        // This is never called in practice.
-        std::terminate();
-    }
-
     void CallSVC(u32) override {
         // Do something.
     }