IR: '!!' is generated as 'CHECK_NOT_NULL' intrinsic

```
fun <T : Any> CHECK_NOT_NULL(x: T?): x =
  if (x != null) x else throw NullPointerException(...)
```

This allows to compile both Kotlin/JVM and Kotlin/JS effectively.

compiler/testData/ir/irJsText/dynamic/dynamicExclExclOperator.txt

@@ -3,15 +3,6 @@ FILE fqName:<root> fileName:/dynamicExclExclOperator.kt
     VALUE_PARAMETER name:d index:0 type:dynamic
     BLOCK_BODY
       RETURN type=kotlin.Nothing from='public final fun test (d: dynamic): dynamic declared in <root>'
-        BLOCK type=dynamic origin=EXCLEXCL
-          VAR IR_TEMPORARY_VARIABLE name:tmp0_notnull type:dynamic [val]
-            GET_VAR 'd: dynamic declared in <root>.test' type=dynamic origin=null
-          WHEN type=dynamic origin=null
-            BRANCH
-              if: CALL 'public final fun EQEQ (arg0: kotlin.Any?, arg1: kotlin.Any?): kotlin.Boolean declared in kotlin.internal.ir' type=kotlin.Boolean origin=EQEQ
-                arg0: GET_VAR 'val tmp0_notnull: dynamic [val] declared in <root>.test' type=dynamic origin=null
-                arg1: CONST Null type=kotlin.Nothing? value=null
-              then: CALL 'public final fun THROW_NPE (): kotlin.Nothing declared in kotlin.internal.ir' type=kotlin.Nothing origin=EXCLEXCL
-            BRANCH
-              if: CONST Boolean type=kotlin.Boolean value=true
-              then: GET_VAR 'val tmp0_notnull: dynamic [val] declared in <root>.test' type=dynamic origin=null
+        CALL 'public final fun CHECK_NOT_NULL <T> (x: T of kotlin.internal.ir.CHECK_NOT_NULL?): T of kotlin.internal.ir.CHECK_NOT_NULL declared in kotlin.internal.ir' type=dynamic origin=EXCLEXCL
+          <T>: dynamic
+          x: GET_VAR 'd: dynamic declared in <root>.test' type=dynamic origin=null