RFR: JDK-8076073 - shared: PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC needs to be removed from source files

[David Lindholm]

Hi,

Please review this fix that removes the macro 
PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC in gc files and fixes the gcc 
warnings for the format strings. Some files had this macro even though 
there were no warnings in them.

This patch deals with all the source files in 
vm/gc_implementation/shared/ and vm/memory/ that had this macro.

Webrev: http://cr.openjdk.java.net/~david/JDK-8076073/webrev.00/
Bug: https://bugs.openjdk.java.net/browse/JDK-8076073

Testing done: Passed JPRT


Thanks,
David