Add tests for merging SAM wrappers and references

compiler/testData/codegen/bytecodeText/sam/samWrapperOfLambda.kt

@@ -0,0 +1,16 @@
+// FILE: JFoo.java
+
+public class JFoo {
+    public static void foo(Runnable f) {
+        f.run();
+    }
+}
+
+// FILE: Test.kt
+fun test() {
+    JFoo.foo({})
+}
+
+// Lambda inlined into run(), no wrapper class generated:
+// 1 NEW
+// 0 INVOKEINTERFACE

compiler/testData/codegen/bytecodeText/sam/samWrapperOfReference.kt

@@ -0,0 +1,23 @@
+// This optimization is only done by the JVM_IR backend.
+// IGNORE_BACKEND: JVM
+// FILE: JFoo.java
+
+public class JFoo {
+    public static void foo(Runnable f) {
+        f.run();
+    }
+}
+
+// FILE: Test.kt
+class A {
+    fun f() {}
+}
+
+fun test() {
+    JFoo.foo(A()::f)
+}
+
+// Referenced function called from run(), no wrapper class generated:
+// 1 NEW A
+// 2 NEW
+// 0 INVOKEINTERFACE

compiler/tests/org/jetbrains/kotlin/codegen/BytecodeTextTestGenerated.java

@@ -3264,6 +3264,16 @@ public class BytecodeTextTestGenerated extends AbstractBytecodeTextTest {
         public void testSamWrapperForNullableInitialization() throws Exception {
             runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperForNullableInitialization.kt");
         }
+
+        @TestMetadata("samWrapperOfLambda.kt")
+        public void testSamWrapperOfLambda() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperOfLambda.kt");
+        }
+
+        @TestMetadata("samWrapperOfReference.kt")
+        public void testSamWrapperOfReference() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperOfReference.kt");
+        }
     }
 
     @TestMetadata("compiler/testData/codegen/bytecodeText/statements")

compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBytecodeTextTestGenerated.java

@@ -3274,6 +3274,16 @@ public class IrBytecodeTextTestGenerated extends AbstractIrBytecodeTextTest {
         public void testSamWrapperForNullableInitialization() throws Exception {
             runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperForNullableInitialization.kt");
         }
+
+        @TestMetadata("samWrapperOfLambda.kt")
+        public void testSamWrapperOfLambda() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperOfLambda.kt");
+        }
+
+        @TestMetadata("samWrapperOfReference.kt")
+        public void testSamWrapperOfReference() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperOfReference.kt");
+        }
     }
 
     @TestMetadata("compiler/testData/codegen/bytecodeText/statements")