introduce variable: allow introduction of expression from inside for loop if independent from loop vars (IDEA-162911)

java/java-tests/testData/refactoring/introduceVariable/InsideForLoopIndependantFromLoopVariable.after.java

@@ -0,0 +1,9 @@
+class Foo {
+  void foo(String[] input) {
+      int temp = input.length;
+      char[][] board = new char[temp][];
+    for (int i = 0; i < temp; i++) {
+      System.out.println(temp);
+    }
+  }
+}

java/java-tests/testData/refactoring/introduceVariable/InsideForLoopIndependantFromLoopVariable.java

@@ -0,0 +1,8 @@
+class Foo {
+  void foo(String[] input) {
+    char[][] board = new char[input.length][];
+    for (int i = 0; i < input.length; i++) {
+      System.out.println(<selection>input.length</selection>);
+    }
+  }
+}