- removed OP_TAIL.

The amount of support code for this minor optimization was quite large and this stood in the way of streamlining the VM's calling convention, so it was preferable to remove it before moving on.

src/scripting/backend/codegen.h

@@ -404,7 +404,6 @@ public:
 class FxClassDefaults : public FxExpression
 {
 	FxExpression *obj;
-	bool EmitTail;
 
 public:
 	FxClassDefaults(FxExpression *, const FScriptPosition &);
@@ -1257,7 +1256,6 @@ public:
 class FxRandom : public FxExpression
 {
 protected:
-	bool EmitTail = false;
 	FRandom *rng;
 	FxExpression *min, *max;
 
@@ -1267,7 +1265,6 @@ public:
 	FxRandom(FRandom *, FxExpression *mi, FxExpression *ma, const FScriptPosition &pos, bool nowarn);
 	~FxRandom();
 	FxExpression *Resolve(FCompileContext&);
-	PPrototype *ReturnProto();
 	ExpEmit Emit(VMFunctionBuilder *build);
 };
 
@@ -1313,7 +1310,6 @@ public:
 
 class FxRandom2 : public FxExpression
 {
-	bool EmitTail;
 	FRandom * rng;
 	FxExpression *mask;
 
@@ -1322,7 +1318,6 @@ public:
 	FxRandom2(FRandom *, FxExpression *m, const FScriptPosition &pos, bool nowarn);
 	~FxRandom2();
 	FxExpression *Resolve(FCompileContext&);
-	PPrototype *ReturnProto();
 	ExpEmit Emit(VMFunctionBuilder *build);
 };
 
@@ -1336,7 +1331,6 @@ public:
 class FxRandomSeed : public FxExpression
 {
 protected:
-	bool EmitTail;
 	FRandom *rng;
 	FxExpression *seed;
 
@@ -1583,7 +1577,6 @@ public:
 class FxActionSpecialCall : public FxExpression
 {
 	int Special;
-	bool EmitTail;
 	FxExpression *Self;
 	FArgumentList ArgList;
 
@@ -1592,7 +1585,6 @@ public:
 	FxActionSpecialCall(FxExpression *self, int special, FArgumentList &args, const FScriptPosition &pos);
 	~FxActionSpecialCall();
 	FxExpression *Resolve(FCompileContext&);
-	PPrototype *ReturnProto();
 	ExpEmit Emit(VMFunctionBuilder *build);
 };
 
@@ -1752,7 +1744,6 @@ class FxVMFunctionCall : public FxExpression
 {
 	friend class FxMultiAssign;
 
-	bool EmitTail = false;
 	bool NoVirtual;
 	bool hasStringArgs = false;
 	FxExpression *Self;