JVM optimize out temporary variables in bytecode

compiler/testData/codegen/bytecodeText/boxingOptimization/safeCallToPrimitiveEquality1.kt

@@ -1,12 +1,3 @@
-// FILE: J.java
-import org.jetbrains.annotations.NotNull;
-
-public interface J {
-    @NotNull
-    public Integer foo();
-}
-
-// FILE: test.kt
 fun Long.id() = this
 
 fun Short.id() = this
@@ -15,29 +6,20 @@ fun String.drop2() = if (length >= 2) subSequence(2, length) else null
 
 fun doSimple1(s: String?) = s?.length == 3
 
-fun doJava1(s: String?, j: J) = s?.length == j.foo()
-
 fun doLongReceiver1(x: Long?) = x?.id() == 3L
 
 fun doShortReceiver1(x: Short?, y: Short) = x?.id() == y
 
-fun doChain1(s: String?) = s?.drop2()?.length == 1
-
 fun doIf1(s: String?) =
         if (s?.length == 1) "A" else "B"
 
 fun doSimple2(s: String?) = 3 == s?.length
 
-fun doJava2(s: String?, j: J) = j.foo() == s?.length
-
 fun doLongReceiver2(x: Long?) = 3L == x?.id()
 
 fun doShortReceiver2(x: Short?, y: Short) = y == x?.id()
 
-fun doChain2(s: String?) = 1 == s?.drop2()?.length
-
 fun doIf2(s: String?) =
         if (1 == s?.length) "A" else "B"
 
-// `doJava1`/`doJava2` box `s?.length` instead of unboxing `j.foo()`:
-// 2 valueOf
+// 0 valueOf

compiler/testData/codegen/bytecodeText/boxingOptimization/safeCallToPrimitiveEquality2.kt

@@ -0,0 +1,7 @@
+fun String.drop2() = if (length >= 2) subSequence(2, length) else null
+
+fun doChain1(s: String?) = s?.drop2()?.length == 1
+
+fun doChain2(s: String?) = 1 == s?.drop2()?.length
+
+// 0 valueOf

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