[FIR] Approximate integer constants in lhs of callable reference

compiler/fir/analysis-tests/testData/resolve/references/integerLiteralInLhs.kt

@@ -0,0 +1,9 @@
+fun Short.foo(): Int = 1
+fun Int.foo(): Int = 2
+
+fun testRef(f: () -> Int) {}
+
+fun test() {
+    // should resolve to Int.foo
+    testRef(1::foo)
+}

compiler/fir/analysis-tests/testData/resolve/references/integerLiteralInLhs.txt

@@ -0,0 +1,12 @@
+FILE: integerLiteralInLhs.kt
+    public final fun R|kotlin/Short|.foo(): R|kotlin/Int| {
+        ^foo Int(1)
+    }
+    public final fun R|kotlin/Int|.foo(): R|kotlin/Int| {
+        ^foo Int(2)
+    }
+    public final fun testRef(f: R|() -> kotlin/Int|): R|kotlin/Unit| {
+    }
+    public final fun test(): R|kotlin/Unit| {
+        R|/testRef|(Int(1)::R|/foo|)
+    }