More accurate import conflict detection

idea/testData/addImport/ImportSecondFunction.kt

@@ -0,0 +1,7 @@
+// IMPORT: dependency.div
+import java.math.BigDecimal
+import kotlin.math.div
+
+fun foo(d1: BigDecimal, d2: BigDecimal) {
+    val d = d1 / d2
+}