When building the jdk with GCC 7.3, a bunch of new warnings are
triggered. These include:
* implicit-fallthrough
* shift-negative-value
* misleading-indentation
* maybe-uninitialized
I won't attempt to fix any of these at this point, but rather just
disable the warnings. I have created followup issues (or added to
existing ones where applicable) for each library/executable where
warnings need to be evaluated.
Bug: https://bugs.openjdk.java.net/browse/JDK-8196985
Webrev: http://cr.openjdk.java.net/~erikj/8196985/webrev.01/
/Erik
