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

[Andrew Wilkins]

Check all Extract referrers with a matching index, not just the first one.


http://reviews.llvm.org/D6785

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

EMAIL PREFERENCES
  http://reviews.llvm.org/settings/panel/emailpreferences/
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