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A call to @llvm.trap can be expected to be cold (i.e. unlikely to be reached in a normal program execution). Outlining paths which unconditionally trap is an important memory saving. As the hot/cold splitting pass (imho) should not treat all noreturn calls as cold, explicitly mark @llvm.trap cold so that it can be outlined. Split out of https://reviews.llvm.org/D54244. Differential Revision: https://reviews.llvm.org/D54329 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@346885 91177308-0d34-0410-b5e6-96231b3b80d8