Change Signature: Represent parameter/receiver types using KotlinTypeInfo

idea/testData/quickfix/changeSignature/matchFunctionLiteralWithSAMType.after.kt

@@ -2,5 +2,5 @@
 // DISABLE-ERRORS
 
 fun main(args: Array<String>) {
-    Test<String>().perform("") { s: String?, s1: String? -> }
+    Test<String>().perform("") { s: String, s1: String -> }
 }

idea/testData/quickfix/createFromUsage/createVariable/parameter/platformType.after.kt

@@ -1,4 +1,4 @@
 // "Create parameter 's'" "true"
 // ERROR: Unresolved reference: s
 
-internal fun foo(s: String?) = C(s)
+internal fun foo(s: String) = C(s)

idea/testData/refactoring/introduceJavaParameter/javaMethodOverridingKotlinFunctionWithUsages.1.kt.after

@@ -4,9 +4,9 @@ fun test() {
 }
 
 abstract class K0 {
-    abstract fun foo(c: Int, a1: A?): Int
+    abstract fun foo(c: Int, a1: A): Int
 }
 
 open class K: K0() {
-    override fun foo(c: Int, a1: A?) = a + b + c
+    override fun foo(c: Int, a1: A) = a + b + c
 }