[8u20] RFR (XS): 8036619: Shark: add LLVM 3.4 support

[Mario Torre]

Resending with correct webrev and subject :)

I would like to ask the backport of the changes made for the following
bug report into JDK 8 (jdk8u20):

https://bugs.openjdk.java.net/browse/JDK-8036619

The changes apply cleanly without modification:

http://cr.openjdk.java.net/~neugens/zero-2014-02-24/webrev.03/

The related changes for JDK 9 are here:

http://cr.openjdk.java.net/~neugens/zero-2014-02-24/webrev.02/

The discussion here:

http://mail.openjdk.java.net/pipermail/hotspot-dev/2014-March/012814.html

and here:

http://mail.openjdk.java.net/pipermail/hotspot-dev/2014-February/012679.html

I can't push myself, so if OK, someone would need to do for me.

Cheers,
Mario