RFR (XXS) [URGENT]: 8048232: Fix for 8046471 breaks PPC64 build

[Volker Simonis]

Hi,

could somebody please review and push the following tiny change:

http://cr.openjdk.java.net/~simonis/webrevs/8048232/
https://bugs.openjdk.java.net/browse/JDK-8048232

It fixes the build on Linux/PPC64 after "8046471 Use
OPENJDK_TARGET_CPU_ARCH instead of legacy value for hotspot ARCH".

Before 8046471, the top-level make passed ARCH=ppc64 to the HotSpot
make. After 8046471, it now passes ARCH=ppc. But there was one place
in  make/linux/Makefile which checked for ARCH=ppc64 in order to
disable the TIERED build. This place has to be adapted to handle the
new ARCH value.

Please push this right to http://hg.openjdk.java.net/jdk9/hs/hotspot
in order to get it into http://hg.openjdk.java.net/jdk9/dev/hotspot
together with 8046471.

Note: this change depends on 8046471 in the hotspot AND in the
top-level directory!

Thank you and best regards,
Volker