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PARTIAL MERGE (PARTLY BROKEN).

See unsolved conflicts in: aarch64/TO_MERGE and riscV/TO_MERGE

WARNING:
 interface of va_args and assembly sections have changed

Closes: #389

Merge branch 'riscv-work-rules' of gricad-gitlab.univ-grenoble-alpes.fr:sixcy/CompCert into riscv-work-rules

On PowerPC/Diab, common declarations must not be used for small data sections.

Add a `~common` option to `PrintAsmaux.variable_section` to control
the use of common declarations.  The default is whatever is specified
on the command line using the `-fcommon` and `-fno-common` options.

Use `~common:false` for `Section_small_data` on PowerPC / Diab.

Note that on PowerPC/Linux, GCC uses common declarations for uninitialized
variables in small data section, so we keep doing this in CompCert as well.

Distinguish between:
- uninitialized variables, which can go in COMM if supported
- variables initialized with fixed, numeric quantities,
  which can go in a readonly section if "const"
- variables initialized with symbol addresses which may need relocation,
  which cannot go in a readonly section even if "const",
  but can go in a special "const_data" section.

Also: on macOS, use ".const" instead of ".literal8" for literals,
as not all literals have size 8.

This is a generalization of the previous PrintAsmaux.common_section
function that
- handles initialized variables in addition to uninitialized variables;
- can be used for Section_const, not just for Section_data.

Branch expansions activated and configured in the checker (but admitted) and bugfix in the expansion liveness modification