JVM_IR handle @EnhancedNullability types in null check simplification

compiler/testData/codegen/box/safeCall/safeCallSimplificationEnhancedNullabilityType.kt

@@ -0,0 +1,16 @@
+// TARGET_BACKEND: JVM
+// FILE: safeCallSimplificationEnhancedNullabilityType.kt
+
+fun String.zap() = "failed"
+
+fun box() =
+    J.nullString()?.zap()
+        ?: "OK"
+
+// FILE: J.java
+import org.jetbrains.annotations.NotNull;
+
+public class J {
+    @NotNull
+    public static String nullString() { return null; }
+}

compiler/testData/codegen/box/safeCall/safeCallSimplificationFlexibleType.kt

@@ -0,0 +1,13 @@
+// TARGET_BACKEND: JVM
+// FILE: safeCallSimplificationFlexibleType.kt
+
+fun String.zap() = "failed"
+
+fun box() =
+    J.nullString()?.zap()
+        ?: "OK"
+
+// FILE: J.java
+public class J {
+    public static String nullString() { return null; }
+}