Rename result to $result

this way it does not interfere with user-defined variables.
 #KT-28535 Fixed

compiler/testData/checkLocalVariablesTable/parametersInSuspendLambda/underscoreNames.kt

@@ -15,4 +15,4 @@ suspend fun test() = foo(A()) { (x_param, _, y_param) -> x_param + y_param }
 // VARIABLE : NAME=x_param TYPE=Ljava/lang/String; INDEX=3
 // VARIABLE : NAME=y_param TYPE=Ljava/lang/String; INDEX=4
 // VARIABLE : NAME=this TYPE=LUnderscoreNamesKt$test$2; INDEX=0
-// VARIABLE : NAME=result TYPE=Ljava/lang/Object; INDEX=1
+// VARIABLE : NAME=$result TYPE=Ljava/lang/Object; INDEX=1