Make JarJar abort when it can't read a .class file.

This change avoids future situations where jarjar silently skips
class files that it can't read (as happened with files compiled for
Java 8)

Bug: 27637680
(cherry picked from commit 8795f34e379f7d29be2ee6cc0b9377106a1d96d7)

Change-Id: I29390c3004516f050ca470a9798bfca05d306c75
1 file changed