[wasm] Remove unused parameter from Drop

Neither Liftoff nor the WasmGraphBuildingInterface use the parameter,
hence drop it.

R=jkummerow@chromium.org

Change-Id: Ia7f2b81dfc95f31c27e12d4ada07c5603a34abff
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2593335
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71784}

src/wasm/baseline/liftoff-compiler.cc

@@ -1722,7 +1722,7 @@ class LiftoffCompiler {
     __ PushRegister(ValueType::Ref(arg.type.heap_type(), kNonNullable), obj);
   }
 
-  void Drop(FullDecoder* decoder, const Value& value) {
+  void Drop(FullDecoder* decoder) {
     auto& slot = __ cache_state()->stack_state.back();
     // If the dropped slot contains a register, decrement it's use count.
     if (slot.is_reg()) __ cache_state()->dec_used(slot.reg());
@@ -4117,7 +4117,7 @@ class LiftoffCompiler {
 
     __ bind(&cont_false);
     // Drop the branch's value, restore original value.
-    Drop(decoder, obj);
+    Drop(decoder);
     __ PushRegister(obj.type, obj_reg);
   }
 

src/wasm/function-body-decoder-impl.h

@@ -993,7 +993,7 @@ struct ControlBase : public PcForErrors<validate> {
   F(RefNull, ValueType type, Value* result)                                    \
   F(RefFunc, uint32_t function_index, Value* result)                           \
   F(RefAsNonNull, const Value& arg, Value* result)                             \
-  F(Drop, const Value& value)                                                  \
+  F(Drop)                                                                      \
   F(DoReturn, Vector<Value> values)                                            \
   F(LocalGet, Value* result, const LocalIndexImmediate<validate>& imm)         \
   F(LocalSet, const Value& value, const LocalIndexImmediate<validate>& imm)    \
@@ -2953,8 +2953,8 @@ class WasmFullDecoder : public WasmDecoder<validate> {
   }
 
   DECODE(Drop) {
-    Value value = Pop(0);
-    CALL_INTERFACE_IF_REACHABLE(Drop, value);
+    Pop(0);
+    CALL_INTERFACE_IF_REACHABLE(Drop);
     return 1;
   }
 

src/wasm/graph-builder-interface.cc

@@ -277,7 +277,7 @@ class WasmGraphBuildingInterface {
     result->node = BUILD(RefAsNonNull, arg.node, decoder->position());
   }
 
-  void Drop(FullDecoder* decoder, const Value& value) {}
+  void Drop(FullDecoder* decoder) {}
 
   void DoReturn(FullDecoder* decoder, Vector<Value> values) {
     base::SmallVector<TFNode*, 8> nodes(values.size());