[gcc/devel/c++-coroutines] Merge master r11-2927.

[Iain D Sandoe]

https://gcc.gnu.org/g:55179eb2451df67e9fdb2f120920b1f7f8b1fde3

commit 55179eb2451df67e9fdb2f120920b1f7f8b1fde3
Merge: 49abbd2a8aa 26c24398d36
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Fri Aug 28 18:52:56 2020 +0100

    Merge master r11-2927.
    
            * Merge master r11-2927-g26c24398d361.

Diff:

 gcc/ChangeLog                                      | 208 +++++++++++++++++++++
 gcc/DATESTAMP                                      |   2 +-
 gcc/ada/ChangeLog                                  |   6 +
 gcc/c/ChangeLog                                    |   5 +
 gcc/c/c-decl.c                                     |   5 +-
 gcc/common/config/i386/i386-common.c               |   4 +-
 gcc/config/aarch64/aarch64-sve.md                  |  42 ++++-
 gcc/config/gcn/gcn-tree.c                          |   2 +-
 gcc/config/i386/i386-expand.c                      |   6 +
 gcc/config/i386/sse.md                             |  24 +++
 gcc/config/rs6000/rs6000.c                         |   6 +-
 gcc/cp/ChangeLog                                   |  11 ++
 gcc/doc/rtl.texi                                   |   2 +-
 gcc/fortran/ChangeLog                              |  11 ++
 gcc/fortran/simplify.c                             |  14 +-
 gcc/fortran/trans-array.c                          |  10 +-
 gcc/ggc-common.c                                   |   2 +-
 gcc/go/gofrontend/MERGE                            |   2 +-
 gcc/jit/jit-recording.c                            |   2 +-
 gcc/lto/ChangeLog                                  |   5 +
 gcc/testsuite/ChangeLog                            |  50 +++++
 .../gcc.dg/Wbuiltin-declaration-mismatch-16.c      |  12 ++
 gcc/testsuite/gcc.dg/pr96579.c                     |   2 +-
 .../gcc.target/aarch64/mem-shift-canonical.c       |   1 +
 gcc/testsuite/gcc.target/aarch64/sve/pr96357.c     |  25 +++
 gcc/testsuite/gcc.target/hppa/shadd-2.c            |   2 +-
 gcc/testsuite/gcc.target/i386/double_mask_reg-1.c  |  19 ++
 .../gfortran.dg/optional_assumed_charlen_2.f90     |  48 +++++
 gcc/testsuite/gfortran.dg/reshape_8.f90            |  14 ++
 libgo/testsuite/gotest                             |   4 +-
 libstdc++-v3/ChangeLog                             |  92 +++++++++
 libstdc++-v3/include/std/chrono                    |  45 ++++-
 .../duration/requirements/reduced_period.cc        | 131 +++++++++++++
 .../20_util/duration/requirements/typedefs_neg2.cc |   3 +-
 34 files changed, 780 insertions(+), 37 deletions(-)