KT-2334 partly fix: boolean to object coercion

compiler/backend/src/org/jetbrains/jet/codegen/StackValue.java

@@ -447,7 +447,7 @@ public abstract class StackValue {
                 putTuple0Instance(v);
                 return;
             }
-            if (type != Type.BOOLEAN_TYPE && type.equals(JetTypeMapper.TYPE_OBJECT) && type.equals(JetTypeMapper.JL_BOOLEAN_TYPE)) {
+            if (type != Type.BOOLEAN_TYPE && !type.equals(JetTypeMapper.TYPE_OBJECT) && !type.equals(JetTypeMapper.JL_BOOLEAN_TYPE)) {
                 throw new UnsupportedOperationException("don't know how to put a compare as a non-boolean type " + type);
             }
             putAsBoolean(v);
@@ -534,10 +534,12 @@ public abstract class StackValue {
                 myOperand.put(type, v);    // the operand will remove itself from the stack if needed
                 return;
             }
-            if (type != Type.BOOLEAN_TYPE) {
+            if (type != Type.BOOLEAN_TYPE && !type.equals(JetTypeMapper.TYPE_OBJECT) && !type.equals(JetTypeMapper.JL_BOOLEAN_TYPE)) {
                 throw new UnsupportedOperationException("don't know how to put a compare as a non-boolean type");
             }
             putAsBoolean(v);
+            if(type != Type.BOOLEAN_TYPE)
+                box(Type.BOOLEAN_TYPE,type,v);
         }
 
         @Override

compiler/testData/codegen/regressions/kt2334.kt

@@ -0,0 +1,13 @@
+import kotlin.test.*
+import org.junit.Test as test
+
+public class Test {
+    test fun f(): Unit {
+        assertEquals(true, !false)
+    }
+}
+
+fun box() : String {
+  Test().f()
+  return "OK"
+}

compiler/tests/org/jetbrains/jet/codegen/StdlibTest.java

@@ -337,6 +337,10 @@ public class StdlibTest extends CodegenTestCase {
         blackBoxFile("regressions/kt1800.kt");
     }
 
+    public void testKt2334() {
+        blackBoxFile("regressions/kt2334.kt");
+    }
+
     public void testUptoDownto() {
         blackBoxFile("uptoDownto.kt");
     }