emit_x64: EmitX64::Emit doesn't need descriptor argument

src/backend_x64/emit_x64.cpp

@@ -45,7 +45,9 @@ static void EraseInstruction(IR::Block& block, IR::Inst* inst) {
     block.Instructions().erase(block.Instructions().iterator_to(*inst));
 }
 
-EmitX64::BlockDescriptor EmitX64::Emit(const Arm::LocationDescriptor descriptor, Dynarmic::IR::Block& block) {
+EmitX64::BlockDescriptor EmitX64::Emit(IR::Block& block) {
+    const Arm::LocationDescriptor& descriptor = block.Location();
+
     reg_alloc.Reset();
 
     code->int3();

src/backend_x64/emit_x64.h

@@ -34,8 +34,11 @@ public:
         size_t size;      ///< Length in bytes of emitted code
     };
 
-    /// Emit host machine code for a basic block starting at `descriptor` with intermediate representation `ir`.
-    BlockDescriptor Emit(const Arm::LocationDescriptor descriptor, IR::Block& ir);
+    /**
+     * Emit host machine code for a basic block with intermediate representation `ir`.
+     * @note ir is modified.
+     */
+    BlockDescriptor Emit(IR::Block& ir);
 
     /// Looks up an emitted host block in the cache.
     boost::optional<BlockDescriptor> GetBasicBlock(Arm::LocationDescriptor descriptor) {

src/backend_x64/interface_x64.cpp

@@ -100,7 +100,7 @@ private:
         Optimization::GetSetElimination(ir_block);
         Optimization::DeadCodeElimination(ir_block);
         Optimization::VerificationPass(ir_block);
-        return emitter.Emit(descriptor, ir_block);
+        return emitter.Emit(ir_block);
     }
 };