[RFR] [8u] 8251120: HotSpot build assumes ENABLE_JFR is set to either true or false

[Andrew Hughes]

Bug: https://bugs.openjdk.java.net/browse/JDK-8251120
Webrev: https://cr.openjdk.java.net/~andrew/openjdk8/8251120/webrev.01/

The HotSpot build on *nix systems currently assumes that ENABLE_JFR is
set to either true or false. This is the case when the HotSpot build
is invoked via the configure build system, but not otherwise, as
nothing in the Makefiles actually sets it.

A simple fix is to invert the tests for false, so only true is checked
for, and false and undefined are assumed to be the same. Windows
already only checks for true, so no changes are needed there.

Ok for 8u?

Thanks,
-- 
Andrew :)

Senior Free Java Software Engineer
OpenJDK Package Owner
Red Hat, Inc. (http://www.redhat.com)

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