RFR: 8148361: Need to disable the thread local storage compiler option for ios

Gary Adams gary.adams at oracle.com
Wed Jan 27 12:42:13 UTC 2016

When the sync with jdk9 b102 was pulled into mobile/dev repos a new
feature for thread local storage was over looked. Most modern compilers
include support for thread local declaration, but this feature is 
not supported by Apple's clang compiler.

This change declares USE_LIBRARY_BASED_TLS_ONLY along with other
TARGET_OS_IPHONE declarations in the hotspot globalDefinitions_gcc.hpp file.

   Issue: https://bugs.openjdk.java.net/browse/JDK-8148361
   Webrev: http://cr.openjdk.java.net/~gadams/8148361/webrev.00/

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