[LifetimeAnalysis] Only collect trace values.

Previously, every value for which there was a debug_value instruction
was added to liveness.  Only add those with the [trace] flag set.

Author: nate-chandler

lib/SILOptimizer/UtilityPasses/OSSALifetimeAnalysis.cpp

@@ -110,6 +110,8 @@ void OSSALifetimeAnalysis::run() {
     for (auto &block : function) {
       for (SILInstruction *inst : deleter.updatingRange(&block)) {
         if (auto *debugValue = dyn_cast<DebugValueInst>(inst)) {
+          if (!debugValue->hasTrace())
+            continue;
           traceValues.push_back(debugValue->getOperand());
           deleter.forceDelete(debugValue);
         }