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In r210492 the logic of calculateDbgValueHistory was changed to end register variable live ranges at the end of MBB conditionally on the fact that the register was or not clobbered by the function body. This requires an initial scan of all the operands of the function to collect all clobbered registers. In a second pass over all instructions, we compare this set with the set of clobbered registers for the current MachineInstruction. This modification incurred a compilation time regression on some benchmarks: the debug info emission phase takes ~10% more time. While a small performance hit is unavoidable due to the initial scan requirement, we can improve the situation by avoiding to create too many temporary sets and just use lambdas to work directly on the result of the initial scan. Fixes <rdar://problem/17884104> Patch by Frederic Riss! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214987 91177308-0d34-0410-b5e6-96231b3b80d8
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