Duncan P. N. Exon Smith 57cbdfc99a BFI: Saturate when combining edges to a successor ...

When a loop gets bundled up, its outgoing edges are quite large, and can
just barely overflow 64-bits.  If one successor has multiple incoming
edges -- and that successor is getting all the incoming mass --
combining just its edges can overflow.  Handle that by saturating rather
than asserting.

This fixes PR21622.

llvm-svn: 223500

2014-12-05 19:13:42 +00:00

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