Hello,When the new hotspot build was introduced, we missed converting the support for compiling in code coverage using gcov. This patch fixes that. While making the change I discovered that the LEGACY_EXTRA_*FLAGS variables are now unused and can finally be completely removed, so I went ahead and did that too.
Bug: https://bugs.openjdk.java.net/browse/JDK-8171922 Webrev: http://cr.openjdk.java.net/~erikj/8171922/webrev.01/ /Erik
