allow putting an Invert operation on stack as a void type (KT-1634)

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

@@ -511,6 +511,10 @@ public abstract class StackValue {
 
         @Override
         public void put(Type type, InstructionAdapter v) {
+            if (type == Type.VOID_TYPE) {
+                myOperand.put(type, v);    // the operand will remove itself from the stack if needed
+                return;
+            }
             if (type != Type.BOOLEAN_TYPE) {
                 throw new UnsupportedOperationException("don't know how to put a compare as a non-boolean type");
             }

compiler/testData/codegen/regressions/kt1634.kt

@@ -0,0 +1,4 @@
+fun box(): String {
+    !true
+    return "OK"
+}

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

@@ -432,4 +432,8 @@ public class PrimitiveTypesTest extends CodegenTestCase {
     public void testKt1508 () {
         blackBoxFile("regressions/kt1508.kt");
     }
+
+    public void testKt1634() {
+        blackBoxFile("regressions/kt1634.kt");
+    }
 }