Relevant changes from flang 19 cycle

[h-vetinari]

In no way shape or form is this exhaustive, but I occasionally look at the commits landing in flang (though less regularly recently), and leave these notes, mostly for myself when we get to building it:

• llvm/llvm-project@8d53866 --> no more Fortran_main
• llvm/llvm-project@5adcfd4 --> necessary to build OpenBLAS with OpenMP-support
• llvm/llvm-project@2df06e4
• llvm/llvm-project@7ce8d2e
• llvm/llvm-project@7647174 --> should be able to remove compiler-rt on linux

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Some relevant issues (for us)

• [flang] OpenBLAS 0.3.27 (with openmp) not buildable on windows with flang 18 llvm/llvm-project#86463
• [flang][driver] impossible to combine -shared with linking to Fortran_main (flang 18.1) llvm/llvm-project#92496
• [flang][compiler-rt] incompatible names for clang_rt.builtins llvm/llvm-project#95698

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flang-new rename still hasn't landed yet. Also see notes for the flang development calls.

[h-vetinari]

Closing as obsolete