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------------------------------------------------------------------------ r243057 | spatel | 2015-07-23 15:56:53 -0700 (Thu, 23 Jul 2015) | 16 lines fix crash in machine trace metrics due to processing dbg_value instructions (PR24199) The test in PR24199 ( https://llvm.org/bugs/show_bug.cgi?id=24199 ) crashes because machine trace metrics was not ignoring dbg_value instructions when calculating data dependencies. The machine-combiner pass asks machine trace metrics to calculate an instruction trace, does some reassociations, and calls MachineInstr::eraseFromParentAndMarkDBGValuesForRemoval() along with MachineTraceMetrics::invalidate(). The dbg_value instructions have their operands invalidated, but the instructions are not expected to be deleted. On a subsequent loop iteration of the machine-combiner pass, machine trace metrics would be called again and die while accessing the invalid debug instructions. Differential Revision: http://reviews.llvm.org/D11423 ------------------------------------------------------------------------ git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_37@243662 91177308-0d34-0410-b5e6-96231b3b80d8