They were previously in SyntheticSections.h, but now there are
a bunch of non-synthetic section names in the list.
Also renamed __functionStarts to __func_starts for uniformity with
other section names + keeps the name under 16 characters (in case we ever
want to write it out as a real section).
clang-tidy: warning: invalid case style for variable 'export_'; cannot be fixed because 'export' would conflict with a keyword [readability-identifier-naming]
not useful