Backports for Julia 1.8.5

[KristofferC]

Backported PRs:

• Restore libgcc_s symlinking in !macOS #47986
• [Backport] Fix half precision in system image #48010
• [CompilerSupportLibraries_jll] Add libssp as product on Windows #48012
• [CompilerSupportLibraries_jll] Add libssp for more platforms #48027
• Restore libgcc_s symlinking in !macOS #47986
• use the correct env variable name to set default openblas num threads #48064

Need manual backport:

• Fix missing GC root in Symbol construction #47865

Contains multiple commits, manual intervention needed:

• Fix SROA miscompile in large functions #46819

Non-merged PRs with backport label:

• Reland: Improve performance of global code by emitting fewer atomic barriers. #47636
• improve inferrability of create_expr_cache #46801

[KristofferC]

@nanosoldier runtests(ALL, vs = ":release-1.8", configuration = (buildflags=["LLVM_ASSERTIONS=1", "FORCE_ASSERTIONS=1"],), vs_configuration=(buildflags=["LLVM_ASSERTIONS=1", "FORCE_ASSERTIONS=1"],))

[KristofferC]

@nanosoldier runbenchmarks(ALL, vs = ":release-1.8")

[nanosoldier]

Your benchmark job has completed - possible performance regressions were detected. A full report can be found here.

[nanosoldier]

Your package evaluation job has completed - possible new issues were detected. A full report can be found here.

[KristofferC]

Parsers failure is a bug in the package.