[PATCH 1/N] Introduce dump_flags_t type and use it instead of int type.

[Martin Liška]

Hello.

There's first patch that just defines dump_flags_t as uint64_t and changes all
corresponding interfaces that do use it. There's a problematic impact that
all targets have to include dumpfile.h just right after coretypes.h. That makes
the patch harder to properly test. I tried couple of cross-compilers and it works.

Patch can bootstrap on ppc64le-redhat-linux and survives regression tests.
I've been also testing i686-linux-gnu bootstrap and x86_64-linux-gnu targets.

Thoughts?
Martin
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