[foreign] RFR 8217727: drop AVX compiler directives from panama/foreign tests

[Maurizio Cimadamore]

Hi,
the use of some AVX specific settings in some Panama/foreign tests can 
cause spurious failures when tests are executed on platforms w/o AVX 
support.

This patch removes AVX-specific dependencies from tests.

http://cr.openjdk.java.net/~mcimadamore/panama/8217727/

Cheers
Maurizio