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Summary: It is possible for some passes to materialize a call to a libcall (ex: ldexp, exp2, etc), but these passes will not mark the call as a gc-leaf-function. All libcalls are actually gc-leaf-functions, so we change llvm::callsGCLeafFunction() to tell us that available libcalls are equivalent to gc-leaf-function calls. Reviewers: sanjoy, anna, reames Reviewed By: anna Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D35840 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309291 91177308-0d34-0410-b5e6-96231b3b80d8