Fix ILAst ldfld/stfld pretty-printing.

ICSharpCode.Decompiler/IL/Instructions/MemoryInstructions.cs

@@ -44,7 +44,7 @@ namespace ICSharpCode.Decompiler.IL
 					output.Write("ldfld ");
 					Disassembler.DisassemblerHelpers.WriteOperand(output, field);
 					output.Write('(');
-					this.target.WriteTo(output, options);
+					target.WriteTo(output, options);
 					output.Write(')');
 					return;
 				} else if (this.MatchLdsFld(out field)) {
@@ -66,16 +66,16 @@ namespace ICSharpCode.Decompiler.IL
 					output.Write("stfld ");
 					Disassembler.DisassemblerHelpers.WriteOperand(output, field);
 					output.Write('(');
-					this.target.WriteTo(output, options);
+					target.WriteTo(output, options);
 					output.Write(", ");
-					this.value.WriteTo(output, options);
+					value.WriteTo(output, options);
 					output.Write(')');
 					return;
 				} else if (this.MatchStsFld(out field, out value)) {
 					output.Write("stsfld ");
 					Disassembler.DisassemblerHelpers.WriteOperand(output, field);
 					output.Write('(');
-					this.value.WriteTo(output, options);
+					value.WriteTo(output, options);
 					output.Write(')');
 					return;
 				}