[PATCH] [AArch64] Check Dest Resgister Liveness in CondOpt pass

[Sergey Dmitrouk]

Hi,

Somehow from instruction reference and comments I mistakenly assumed that
such instructions won't occur with liveout destinations, but now I see it
should be checked.  I tried to make a test-case for a couple hours, but
had no luck here.

Thanks for catching this!

Regards,
Sergey

================
Comment at: lib/Target/AArch64/AArch64ConditionOptimizer.cpp:130
@@ -128,1 +129,3 @@
+  AU.addRequired<LiveIntervals>();
+  AU.addPreserved<LiveIntervals>();
   MachineFunctionPass::getAnalysisUsage(AU);
----------------
There is `INITIALIZE_PASS_BEGIN`...`INITIALIZE_PASS_END` above (not full context, by the way), `LiveIntervals` should be added there as well or just drop lines from `namespace llvm {` to `INITIALIZE_PASS_END` (might be preferred).

http://reviews.llvm.org/D6048