Basic implementation of partial body resolve

idea/testData/resolve/partialBodyResolve/DeclarationsBefore.kt

@@ -0,0 +1,24 @@
+fun foo(p: Int) {
+    x()
+
+    val v1 = p * p
+
+    if (y()) {
+        val v2 = v1 * v1
+        val v3 = v1 * v2
+
+        run {
+            val v2 = 1
+            println(v2)
+        }
+
+        print(<caret>v2)
+
+        run {
+            val v2 = 2
+            println(v2)
+        }
+    }
+
+    z()
+}