JVM_IR KT-43877 fix generic signatures for SAM-converted lambdas

compiler/testData/codegen/bytecodeListing/sam/callableRefGenericSamInterface.kt

@@ -0,0 +1,18 @@
+// WITH_SIGNATURES
+// FILE: t.kt
+
+fun <T> foo(): T = null!!
+
+fun <T> genericSam(): T = J.g(::foo)
+
+// FILE: J.java
+public class J {
+    static <T> T g(Sam<T> s) {
+        return s.get();
+    }
+}
+
+// FILE: Sam.java
+public interface Sam<T> {
+    T get();
+}