Handle va_arg on struct types for the le32 target (PNaCl and Emscripten)

PNaCl and Emscripten can both handle va_arg IR instructions with
struct type.

Also add a test to cover generating a va_arg IR instruction from
va_arg in C on le32 (as already handled by VisitVAArgExpr() in
CGExprScalar.cpp), which was not covered by a test before.

(This fixes https://code.google.com/p/nativeclient/issues/detail?id=2381)

Differential Revision: http://llvm-reviews.chandlerc.com/D2539

llvm-svn: 199830

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