[7u] RFR(M): 8036767 : PPC64: Support for little endian execution model

[Alexander Smundak]

This set of patches is the backport of the corresponding changes for
the OpenJDK9
(see http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/09edc8e9fa4d).
Additional changes were required in the build machinery for corba/,
jdk/ and langtools/ repositories.

http://cr.openjdk.java.net/~asmundak/8036767.7u/corba/webrev.00
http://cr.openjdk.java.net/~asmundak/8036767.7u/hotspot/webrev.00
http://cr.openjdk.java.net/~asmundak/8036767.7u/jdk/webrev.00
http://cr.openjdk.java.net/~asmundak/8036767.7u/langtools/webrev.00

Sasha