[PATCH] AsmWriter/Bitcode: Support specialized debug nodes

[Duncan P. N. Exon Smith]

> On 2015-Feb-06, at 16:26, Duncan P. N. Exon Smith <dexonsmith at apple.com> wrote:
> 
> Assuming the two outstanding reviews go through without change ("IR: Add
> specialized debug info metadata nodes" and "Support: Add
> dwarf::getVirtuality()"), I'm ready to commit assembly/bitcode support
> for all the specialized nodes.

The blocking reviews are complete, and there were a few changes to the
hierarchy, so I've rebased everything on top of r228652.

> (This isn't the end goal; this just models the current schema.)
> 
> Although these augment the assembly syntax, they're fairly obvious and
> mechanical, and (so far) are unreachable by any current frontend.  (I'm
> mostly looking for a rubber stamp here, but feel free to dig deeper!)
> 
>  - all.patch: The whole thing.  Should apply cleanly on top of the
>    patches in the reviews mentioned above.  Not actually that big.

(Now applies cleanly to r228652.)

>  - 0001: a prep commit.

(Committed in r228644.)

>  - 0002-0021: Assembly/bitcode support for each node type.

(Now numbered 0001-0020.)

If someone could take a quick look to confirm there's nothing too
surprising in here I'd appreciate it!

> 
> The next step (after these patches) is to move the classes into place
> underneath the `DIDescriptor` hierarchy.  I'm starting work now on the
> testcase updates to come (I'll attach the upgrade script I use to
> PR22464 once it's written).
> 
> After that we can start improving the hierarchy, adjusting the schema,
> etc.



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