RFR: JDK-8215400: Warn on usage of trampolines with gcc

[Kim Barrett]

> On Jan 4, 2019, at 5:55 AM, Erik Joelsson <erik.joelsson at oracle.com> wrote:
> 
> Hello,
> 
> This small patch adds -Wtrampolines to the default set of warnings applied globally in the OpenJDK build. We do not trigger this warning today, but by adding it, combined with -Werror, we make sure we never will.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8215400
> 
> Webrev: http://cr.openjdk.java.net/~erikj/8215400/webrev.01/
> 
> /Erik

Looks good.