[PATCH] [llgo] Elide alloca for unused received values in select

[Andrew Wilkins]

Hi pcc,

If a receive case in a select statement is not assigned to a named variable, then we can eliminate the alloca and copy at runtime.

http://reviews.llvm.org/D6785

Files:
  irgen/channels.go
  irgen/ssa.go
  test/irgen/select.go

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