[IR] Add Instruction::isLifetimeStartOrEnd, NFC

Instruction::isLifetimeStartOrEnd() checks whether an Instruction is an
llvm.lifetime.start or an llvm.lifetime.end intrinsic.

This was suggested as a cleanup in D55967.

Differential Revision: https://reviews.llvm.org/D56019

llvm-svn: 349964
diff --git a/llvm/lib/CodeGen/SafeStack.cpp b/llvm/lib/CodeGen/SafeStack.cpp
index 7b1c7fe..c356fb5 100644
--- a/llvm/lib/CodeGen/SafeStack.cpp
+++ b/llvm/lib/CodeGen/SafeStack.cpp
@@ -324,11 +324,8 @@
       case Instruction::Invoke: {
         ImmutableCallSite CS(I);
 
-        if (const IntrinsicInst *II = dyn_cast<IntrinsicInst>(I)) {
-          if (II->getIntrinsicID() == Intrinsic::lifetime_start ||
-              II->getIntrinsicID() == Intrinsic::lifetime_end)
-            continue;
-        }
+        if (I->isLifetimeStartOrEnd())
+          continue;
 
         if (const MemIntrinsic *MI = dyn_cast<MemIntrinsic>(I)) {
           if (!IsMemIntrinsicSafe(MI, UI, AllocaPtr, AllocaSize)) {