Update aosp/master LLVM for rebase to r230699.

Change-Id: I2b5be30509658cb8266be782de0ab24f9099f9b9
diff --git a/lib/CodeGen/DeadMachineInstructionElim.cpp b/lib/CodeGen/DeadMachineInstructionElim.cpp
index 48213c1..c17a35d 100644
--- a/lib/CodeGen/DeadMachineInstructionElim.cpp
+++ b/lib/CodeGen/DeadMachineInstructionElim.cpp
@@ -59,6 +59,10 @@
   if (MI->isInlineAsm())
     return false;
 
+  // Don't delete frame allocation labels.
+  if (MI->getOpcode() == TargetOpcode::FRAME_ALLOC)
+    return false;
+
   // Don't delete instructions with side effects.
   bool SawStore = false;
   if (!MI->isSafeToMove(TII, nullptr, SawStore) && !MI->isPHI())