[RewriteStatepointsForGC] Use DenseSet in place of std::set [NFC]

This should be the last cleanup on non-llvm preferred data structures.  I left one use of std::set in an assertion; DenseSet didn't seem to have a tombstone for CallSite defined.  That might be worth fixing, but wasn't worth it for a debug only use.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230084 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed