Fwd: [Patch] Inline Variables for the Standard Library (p0607r0)

[Daniel Krügler]

This patch applies inline to all namespace scope const variables
according to options A and B2 voted in during the Kona meeting, see:

http://wiki.edg.com/pub/Wg21kona2017/StrawPolls/p0607r0.html

During that work it has been found that std::ignore was not declared
constexpr (http://cplusplus.github.io/LWG/lwg-defects.html#2773),
which was fixed as well.

The patch suggests to apply the same fix to implementation-private
constants such as __index_of_v, for example, as well.

Due to the large number of affected variables in header
include/bits/regex_constants.h and include/type_traits, I used a
shortened description of the changes in the ChangeLog instead of
enumerating each constant individually, I hope that this is ok.

Please note that I added the newly introduced _GLIBCXX17_INLINE also
to the commented references of hardware_destructive_interference_size
and hardware_constructive_interference_size in
testsuite/18_support/headers/new/synopsis.cc as a reminder when these
constants will be introduced in the future.

This patch is *untested*, because I cannot make the tests run on my
Windows system.

- Daniel
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