emit_x64: inhibit_emission is obsolete

Not used anymore; unused ever since intrusive lists were introduced.

src/backend_x64/emit_x64.cpp

@@ -46,7 +46,6 @@ static void EraseInstruction(IR::Block& block, IR::Inst* inst) {
 }
 
 EmitX64::BlockDescriptor EmitX64::Emit(const Arm::LocationDescriptor descriptor, Dynarmic::IR::Block& block) {
-    inhibit_emission.clear();
     reg_alloc.Reset();
 
     code->int3();

src/backend_x64/emit_x64.h

@@ -70,7 +70,6 @@ private:
     void Patch(Arm::LocationDescriptor desc, CodePtr bb);
 
     // Per-block state
-    std::set<IR::Value*> inhibit_emission;
     RegAlloc reg_alloc;
 
     // State