JVM_IR: make primitive == object slightly less lazy.

Discarding the value used to leave an unused-but-never-destroyed
temporary variable. It's best to not separate calls to `enterTemp`
and `leaveTemp`.

Not sure what kind of test to add though, since this is minor -- if the
result of the comparison is discarded, then the entire statement is more
or less pointless.

 #KT-42251 Fixed

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

@@ -1810,6 +1810,11 @@ public class BytecodeTextTestGenerated extends AbstractBytecodeTextTest {
         public void testSimpleConstructorNotRedundantNotOptimizable() throws Exception {
             runTest("compiler/testData/codegen/bytecodeText/deadCodeElimination/simpleConstructorNotRedundantNotOptimizable.kt");
         }
+
+        @TestMetadata("unusedPrimitiveAndObjectEquals.kt")
+        public void testUnusedPrimitiveAndObjectEquals() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/deadCodeElimination/unusedPrimitiveAndObjectEquals.kt");
+        }
     }
 
     @TestMetadata("compiler/testData/codegen/bytecodeText/defaultArguments")