Don't use named arguments when IL stack is empty after the stloc.

An empty stack indicates the statement is complete, so the code
is usually more readable if we keep the local variable.

ICSharpCode.Decompiler/IL/ILReader.cs

@@ -1147,7 +1147,9 @@ namespace ICSharpCode.Decompiler.IL
 
 		private ILInstruction Stloc(int v)
 		{
-			return new StLoc(localVariables[v], Pop(localVariables[v].StackType));
+			return new StLoc(localVariables[v], Pop(localVariables[v].StackType)) {
+				ILStackWasEmpty = currentStack.IsEmpty
+			};
 		}
 		
 		private ILInstruction LdElem(IType type)

ICSharpCode.Decompiler/IL/Instructions/StLoc.cs

@@ -27,6 +27,13 @@ namespace ICSharpCode.Decompiler.IL
 		/// This field is only used in ILReader and BlockBuilder, and should be ignored by ILAst transforms.
 		/// </summary>
 		internal bool IsStackAdjustment;
+		
+		/// <summary>
+		/// Gets whether the IL stack was empty after this store.
+		/// Only set for store instructions from the IL; not for stores to the stack
+		/// or other stores generated by transforms.
+		/// </summary>
+		internal bool ILStackWasEmpty;
 
 		internal override void CheckInvariant(ILPhase phase)
 		{

ICSharpCode.Decompiler/IL/Transforms/ILInlining.cs

@@ -235,6 +235,9 @@ namespace ICSharpCode.Decompiler.IL.Transforms
 				return true;
 			} else if (r == FindResult.NamedArgument && (options & InliningOptions.IntroduceNamedArguments) != 0) {
 				Debug.Assert(loadInst.OpCode == OpCode.LdLoc);
+				StLoc originalStore = (StLoc)inlinedExpression.Parent;
+				if ((options & InliningOptions.Aggressive) == 0 && originalStore.ILStackWasEmpty)
+					return false;
 				context.Step($"Introduce named argument '{v.Name}'", inlinedExpression);
 				var call = (CallInstruction)loadInst.Parent;
 				if (!(call.Parent is Block namedArgBlock) || namedArgBlock.Kind != BlockKind.CallWithNamedArgs) {
@@ -254,7 +257,7 @@ namespace ICSharpCode.Decompiler.IL.Transforms
 					}
 				}
 				v.Kind = VariableKind.NamedArgument;
-				namedArgBlock.Instructions.Insert(call.IsInstanceCall ? 1 : 0, new StLoc(v, inlinedExpression));
+				namedArgBlock.Instructions.Insert(call.IsInstanceCall ? 1 : 0, originalStore);
 				return true;
 			}
 			return false;