WIP: Bugfixes compiler v1.5.0

DONT MERGE. WIP

WORK IN PROGRESS I will be updating this issue as it progresses

I compiled the MRs related to compiler errors bugfixes from the release 1.5.0 and cherry picked in a bugfix branch:

291f3527b19cc6d5211aad87513731c1670d998f Merge topic 'variant-trivial-copy' !1898
05917e11a17b2e3c13ea3663c67af24911dec575 Merge topic 'gcc-4-trivially-copyable' Merge-request: !1900
3bf7bf23b292e7a3bc15478ec8be793a134166aa Merge topic '443_MSVC_flag_fix' Merge-request: !1919
01a51e16a97865f331de07a3e79bc6c8fa7c693e Merge topic 'gcc-openmp-workaround-fix' Merge-request: !1904
c470df00159563e99415f89ccf2a503669fec9ee Merge topic 'correct_gcc_9_warnings' Merge-request: !1935
349d1562dfcc29034645128588c9c38adec6f515 Merge topic 'gcc_48_iterator_fixes' Merge-request: !1934
8c96769e81fd8c6b08a9d098697b1ea929c625f3 Merge topic 'aligned_union_check_handle_gcc_485' Merge-request: !1930
bc148cc556871ee86a306895b41e07cc99883524 Merge topic 'update_check_for_aligned_union' Merge-request: !1928
a28d2a3a06abba878fc3e290a624c5fe2f91f0fc Merge topic 'intel_fix' Merge-request: !1923
4f8a97b9983241bf0ef6f1b15d716871778613b2 Merge topic 'correct_msvc_2015_failure' Merge-request: !1921
f2aa6ad5be1a97e3fb41ef4680ee2c76c3434ac0 Merge topic 'gcc_61_ice_openmp_and_optimizations' Merge-request: !1950
ec010d2e8d2478544e9e366e5dee8950f2b74e09 Merge topic 'no-deprecated-nvcc-vs' Merge-request: !1949

The branch is locate here:

bugfixes-compiler-v1.5.0

I managed to do cherry picks and build tests for the following MRs:

Merge-request: !1900 Undone
Merge-request: !1919 Works
Merge-request: !1904 Works
Merge-request: !1935 Works
Merge-request: !1934 Works
Merge-request: !1930 Works
Merge-request: !1928 Works
Merge-request: !1923 Works
Merge-request: !1921 Works
Merge-request: !1950 Works
Merge-request: !1949 Works
Merge-request: !1898 Works