[gcc/devel/omp/gcc-15] Merge branch 'releases/gcc-15' into devel/omp/gcc-15

[Tobias Burnus]

https://gcc.gnu.org/g:682e7678f3d2b5b974bf564deea7a405f0fd37bf

commit 682e7678f3d2b5b974bf564deea7a405f0fd37bf
Merge: f34abf47bf57 5327eef7b003
Author: Tobias Burnus <tburnus@baylibre.com>
Date:   Tue Jun 10 21:56:49 2025 +0200

    Merge branch 'releases/gcc-15' into devel/omp/gcc-15
    
    Merge up to r15-9819-g5327eef7b003f6 (June 10, 2025)

Diff:

 gcc/ChangeLog                                      |  95 +++
 gcc/DATESTAMP                                      |   2 +-
 gcc/ada/ChangeLog                                  | 112 +++
 gcc/ada/checks.adb                                 |  15 +-
 gcc/ada/contracts.adb                              | 103 +--
 gcc/ada/einfo.ads                                  |   2 +-
 gcc/ada/exp_aggr.adb                               |  16 +-
 gcc/ada/exp_attr.adb                               |   9 +-
 gcc/ada/exp_ch4.adb                                |  62 +-
 gcc/ada/exp_ch5.adb                                |  24 +-
 gcc/ada/exp_util.adb                               | 148 +++-
 gcc/ada/exp_util.ads                               |  18 +-
 gcc/ada/freeze.adb                                 |  11 +-
 gcc/ada/libgnarl/s-stusta.adb                      |   5 +-
 gcc/ada/sem_case.adb                               |   8 +-
 gcc/ada/sem_ch10.adb                               |   2 +
 gcc/ada/sem_ch12.adb                               |  15 +-
 gcc/ada/sem_ch3.adb                                |   4 +-
 gcc/ada/sem_ch4.adb                                | 911 +++++++++++++++------
 gcc/ada/sem_prag.adb                               |   9 +-
 gcc/cp/ChangeLog                                   |  16 +
 gcc/cp/constexpr.cc                                |   3 +-
 gcc/cp/cp-gimplify.cc                              |  21 +-
 gcc/cp/decl2.cc                                    |  33 +-
 gcc/ext-dce.cc                                     |  17 +-
 gcc/testsuite/ChangeLog                            |  75 ++
 gcc/testsuite/g++.dg/cpp1z/constexpr-if39.C        |  30 +
 gcc/testsuite/g++.dg/cpp2a/constexpr-prvalue2.C    |  26 +
 gcc/tree-vectorizer.h                              |   1 +
 libstdc++-v3/ChangeLog                             |  19 +
 libstdc++-v3/include/bits/chrono.h                 |   2 +
 libstdc++-v3/include/std/format                    |  11 +-
 .../testsuite/20_util/system_clock/99832.cc        |  14 +
 .../testsuite/std/format/functions/format.cc       |  10 +
 34 files changed, 1414 insertions(+), 435 deletions(-)