Do not generate fields for unused suspend lambda parameters

This also allows us to not spill them in the lambda.
But, disable this optimization for local named functions.

 #KT-16222 In progress

compiler/testData/codegen/dumpDeclarations/suspendLambda.kt

@@ -1,6 +1,7 @@
 // WITH_RUNTIME
 public fun invokeCoroutineBuilder() {
     return buildCoroutine {
+        println(this)
     }
 }