[Patch] Don't declare all text sections at the start of the .s

[Rafael Espíndola]

On 13 March 2015 at 18:52, Adrian Prantl <aprantl at apple.com> wrote:
> The last time I fixed such an issue was in r199681, which ensured the __cstring section comes before the debug info.
> To prevent regressing here again, it would be nice to have an assertion that verifies that the first time we are switching to any __TEXT section we have not yet emitted any of the debug info sections.

I like the idea of the assert, since it would catch us ever producing
a regular section after dwarf instead of only when there is a output
difference and someone is looking at debug/no-debug difference.

I assume we still want to make it legal in assembly to create a
__DWARF section first, we just want to avoid printing that ourselves,
correct?

The attached patch is a work in progress. It adds the assert to the
MachO streamer since that is the only central point I could find. In
order to support .s files, the assert is optional and requires a bit
of plumbing.

I can reduce the plumbing on the target side. Some ideas

* Add a createObjTargetStreamer so that targets that only need to add
a target streamer don't need to call createMCObjectStreamer.
* Spit createMCObjectStreamer into COFF/ELF/MachO versions.

Cheers,
Rafael
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