JVM optimize out temporary variables in bytecode

compiler/testData/codegen/bytecodeText/boxingOptimization/safeCallToPrimitiveEquality3.kt

@@ -0,0 +1,16 @@
+// FILE: J.java
+import org.jetbrains.annotations.NotNull;
+
+public interface J {
+    @NotNull
+    public Integer foo();
+}
+
+// FILE: safeCallToPrimitiveEquality3.kt
+
+fun doJava1(s: String?, j: J) = s?.length == j.foo()
+
+fun doJava2(s: String?, j: J) = j.foo() == s?.length
+
+// `doJava1`/`doJava2` box `s?.length` instead of unboxing `j.foo()`:
+// 2 valueOf