Add tests for enhanced java signatures based on AbstractResolvedCallsTest.

Refactor AbstractResolvedCallsTest to support multiple carets (multiple methods being tested  for resolve) in testdata file.

compiler/testData/resolvedCalls/enhancedSignatures/map/mapPutIfAbsent.kt

@@ -0,0 +1,7 @@
+fun valuesNotNull(map: MutableMap<Int, String>) {
+    map.<caret>putIfAbsent(1, "")
+}
+
+fun valuesNullable(map: MutableMap<Int, String?>) {
+    map.<caret>putIfAbsent(1, null)
+}