RFR: JDK-8251541 "no symbols" printed when building hotspot

Thu Aug 13 15:26:42 UTC 2020

Recently a lot of "no symbols" is shown when building hotspot, at least 
on macOS.

This comes from the new/delete operator check which uses nm.

I have checked the source of these problems. Several files are now empty 
due to refactoring and the use of (incidentally) file-wide #ifdefs. So 
we just need to handle the fact that nm can write "no symbols" to stderr.

I also refactored the operator checking to use ExecuteWithLog, which 
would have helped me track down this issue, had it been there from the 
beginning. :)

I have verified that this solves the bug. I have also for testing 
introduced a incorrect use of "new" and verified that this still trigger.

Bug: https://bugs.openjdk.java.net/browse/JDK-8251541
WebRev: 
http://cr.openjdk.java.net/~ihse/JDK-8251541-stop-printing-no-symbol/webrev.01

/Magnus