Revert "DebugInfo: Ensure that all debug location scope chains from instructions within a function, lead to the function itself."

This reverts commit r212085.

This breaks the sanitizer bot... & I thought I'd tried pretty hard not
to do that. Guess I need to try harder.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212089 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AsmPrinter/DwarfDebug.cpp

@@ -786,7 +786,8 @@ void DwarfDebug::finishVariableDefinitions() {
   for (const auto &Var : ConcreteVariables) {
     DIE *VariableDie = Var->getDIE();
     // FIXME: There shouldn't be any variables without DIEs.
-    assert(VariableDie);
+    if (!VariableDie)
+      continue;
     // FIXME: Consider the time-space tradeoff of just storing the unit pointer
     // in the ConcreteVariables list, rather than looking it up again here.
     // DIE::getUnit isn't simple - it walks parent pointers, etc.