Using neverPartOfCompilation() is fine nowadays, but it should be passed a reason

* neverPartOfCompilation() is much safer to use now that it is checked
  statically when building a Native Image.

Author: eregon

src/main/.checkstyle_checks.xml

@@ -144,7 +144,7 @@
     </module>
     <module name="RegexpSinglelineJava">
       <property name="format" value="CompilerAsserts.neverPartOfCompilation\(\)"/>
-      <property name="message" value="Use a @TruffleBoundary instead, which does not fail compilation if called in PE code."/>
+      <property name="message" value="Pass a String argument explaining what to use instead in PE code."/>
     </module>
     <module name="RegexpSinglelineJava">
       <property name="format" value=",\s*@Cached"/>