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dc6b4b4fc2
Add user-supplied C runtime and compiler-rt library functions to llvm.compiler.used to protect them from premature optimization by passes like -globalopt and -ipsccp. Calls to (seemingly unused) runtime library functions can be added by -instcombine and instruction lowering. Patch by Duncan Exon Smith, thanks! Fixes <rdar://problem/14740087> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194514 91177308-0d34-0410-b5e6-96231b3b80d8