[gcc/devel/c++-coroutines] Merge master r10-6661.

[Iain D Sandoe]

https://gcc.gnu.org/g:4cdd0b4525c0408314049e774da954e72839ed4b

commit 4cdd0b4525c0408314049e774da954e72839ed4b
Merge: aef4bd2 7270054
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Sun Feb 16 20:40:07 2020 +0000

    Merge master r10-6661.
    
    2020-02-16 Iain Sandoe <iain@sandoe.co.uk>
    
    	* Merge master r10-6661-g72700543b675.

Diff:

 gcc/ChangeLog                                 |   4 +
 gcc/DATESTAMP                                 |   2 +-
 gcc/c-family/ChangeLog                        |   4 +
 gcc/c-family/c.opt                            |   6 +-
 gcc/cp/ChangeLog                              |   6 ++
 gcc/cp/call.c                                 |   5 +-
 gcc/doc/invoke.texi                           |  10 ++-
 gcc/go/gofrontend/MERGE                       |   2 +-
 gcc/testsuite/ChangeLog                       |  11 +++
 gcc/testsuite/g++.dg/diagnostic/array-init1.C |  11 +++
 gcc/testsuite/lib/target-supports.exp         |   9 ++-
 libbacktrace/ChangeLog                        |   4 +
 libbacktrace/ztest.c                          |   4 +-
 libgo/Makefile.am                             |   5 ++
 libgo/Makefile.in                             |  63 ++++++++++++----
 libstdc++-v3/ChangeLog                        |   6 ++
 libstdc++-v3/include/bits/ranges_algo.h       | 103 +++++++++++++-------------
 libstdc++-v3/include/bits/ranges_algobase.h   |   7 +-
 18 files changed, 179 insertions(+), 83 deletions(-)