This update contains gcc6 6.2.1, synching it to the SLE 12 SP2 version.

It contains the following changes:

- Includes GCC 6.2 release.
- Update HSA_RUNTINE_LIB in gcc6-hsa-enablement.patch
- Make sure newlib crosses for the same target conflict
- re-enable TSAN for aarch64.
- Enable ifunc attribute on archs with support for GNU_IFUNC in glibc for SLE12 and up
-Enable epiphany and rx packages