[ADCE] Fix non-deterministic behaviour due to iterating over a pointer set.
[ADCE] Fix non-deterministic behaviour due to iterating over a pointer set.

Original patch by Yann Laigle-Chapuy

Differential Revision: https://reviews.llvm.org/D64785

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@366215 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm