PATCH: Make sure NVPTX doesn't emit symbols that aren't valid for ptxas

[Eli Bendersky]

Hi Justin,

Please find attached an initial patch for what we've discussed earlier. It
currently simply replaces the invalid symbols (only '.' and '@' may come
from MCSymbol) with a different sequence. Potentially, this can create
collisions, but since ptxas doesn't have general quoting, this is hard to
work around. In any case, it's strictly better than the current situation
which creates invalid assembly.

A more thorough approach could be to keep a map remembering symbol names
and failing loudly in case of collisions. This has a memory usage cost.

PTAL,
Eli
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