Fixes the addVariable/addParam methods in the SymbolTable to check types before casting.
------------- Commit messages: - 8264766: ClassCastException during template compilation (Variable cannot be cast to Param) Changes: https://git.openjdk.java.net/jdk/pull/4398/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4398&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8264766 Stats: 70 lines in 2 files changed: 64 ins; 0 del; 6 mod Patch: https://git.openjdk.java.net/jdk/pull/4398.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/4398/head:pull/4398 PR: https://git.openjdk.java.net/jdk/pull/4398
