[PATCH] [RFC][7/17]TILE-Gx: support pseduo instruction expanding for tilegx

[Jiong WANG]

Three pseudo instructions are defined for tilegx:

Tile::VAARG_SP
Tile::ALLOCA_ADDR:
Tile::ALLOCA_SP

There are here because the special 16byte reserved zone for tilegx.  we need some special handling for vaarg and alloca. we need to absolute stack size, which we can get at expand pseudo instruction stage.

Please review, thanks.

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Regards,
Jiong
Tilera Corporation

http://llvm-reviews.chandlerc.com/D517
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