RFR(S): 8151593: Cleanup definition/usage of INLINE/NOINLINE macros and add xlC support

[Volker Simonis]

Hi,

can I please have a review and a sponsor for the following clean-up change:

http://cr.openjdk.java.net/~simonis/webrevs/2016/8151593/
https://bugs.openjdk.java.net/browse/JDK-8151593

First I only wanted to implement the INLINE macro for xlC in
instanceKlass.inline.hpp. But then I realized that we also define
NOINLINE in various other files so I decided to do it "the right way"
and clean up the code a little bit.

I've now moved the definition of the INLINE/NOINLINE macros to
globalDefinitions_<compiler>.hpp. In the case where there is no
compiler-specific definition, globalDefinitions.hpp defines empty
defaults for the macros.

I've also renamed INLINE to ALWAYSINLINE to match its intention more clearly.

Currently NOINLINE is really only defined on Linux. This is the same
behavior we had before the change. Following some more details:

os_linux.cpp

- removed the handling for gcc < 3 (even we at SAP don't use this anymore :)

objectMonitor.cpp, synchronizer.cpp

- completely removed the annotation with NOINLNE which is there since
pre-OpenJDK times already. The comment mentions that this was required
to prevent build-time failures with 'older' versions of GCC. But we
already build without 'NOINLINE' on Linux/ppc64 since years and I've
also tested that it still works on Linux/x86.

I've Build and smoke-tested on Linux/amd64 and Linux/ppc64,
Solaris/SPARC, MacOS X, AIX and Windows.

Regards,
Volker