Adjust various testData to remove/charAt transformation

compiler/testData/diagnostics/tests/library/Collections.kt

@@ -26,7 +26,7 @@ fun <T> testMutableCollection(c: MutableCollection<T>, t: T) {
 
     val <!UNUSED_VARIABLE!>mutableIterator<!>: MutableIterator<T> = c.iterator()
     c.add(t)
-    c.remove(1)
+    c.remove(<!UNCHECKED_CAST!>1 as T<!>)
     c.addAll(c)
     c.removeAll(c)
     c.retainAll(c)
@@ -52,7 +52,7 @@ fun <T> testList(l: List<T>, <!UNUSED_PARAMETER!>t<!>: T) {
 fun <T> testMutableList(l: MutableList<T>, t: T) {
     val <!UNUSED_VARIABLE!>value<!>: T = l.set(1, t)
     l.add(1, t)
-    l.remove(1)
+    l.removeAt(1)
     val <!UNUSED_VARIABLE!>mutableListIterator<!>: MutableListIterator<T> = l.listIterator()
     val <!UNUSED_VARIABLE!>mutableListIterator1<!>: MutableListIterator<T> = l.listIterator(1)
     val <!UNUSED_VARIABLE!>mutableList<!>: MutableList<T> = l.subList(1, 2)
@@ -84,7 +84,7 @@ fun <T> testMutableSet(s: MutableSet<T>, t: T) {
 
     val <!UNUSED_VARIABLE!>mutableIterator<!>: MutableIterator<T> = s.iterator()
     s.add(t)
-    s.remove(1)
+    s.remove(<!UNCHECKED_CAST!>1 as T<!>)
     s.addAll(s)
     s.removeAll(s)
     s.retainAll(s)

compiler/testData/diagnostics/tests/regressions/DoubleDefine.kt

@@ -3,7 +3,7 @@ import java.util.*
 import java.io.*
 
 fun takeFirst(expr: StringBuilder): Char {
-  val c = expr.charAt(0)
+  val c = expr.get(0)
   expr.deleteCharAt(0)
   return c
 }
@@ -31,7 +31,7 @@ fun evaluateAdd(expr: StringBuilder, numbers: ArrayList<Int>): Int {
 fun evaluate(expr: StringBuilder, numbers: ArrayList<Int>): Int {
   val lhs = evaluateAdd(expr, numbers)
   if (expr.length() > 0) {
-    val <!UNUSED_VARIABLE!>c<!> = expr.charAt(0)
+    val <!UNUSED_VARIABLE!>c<!> = expr.get(0)
     expr.deleteCharAt(0)
   }
   return lhs

compiler/testData/diagnostics/tests/smartCasts/safecalls/extensionCall.kt

@@ -2,5 +2,5 @@ fun String.bar(s: String) = s
 
 fun foo(s: String?) {
     s?.bar(<!DEBUG_INFO_SMARTCAST!>s<!>)
-    s?.charAt(<!DEBUG_INFO_SMARTCAST!>s<!>.length())
+    s?.get(<!DEBUG_INFO_SMARTCAST!>s<!>.length())
 }