[fast-isel] Tell fast-isel to do nothing with the new donothing intrinsic.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159837 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index 07dc365..20848b4 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -573,7 +573,10 @@
// At -O0 we don't care about the lifetime intrinsics.
case Intrinsic::lifetime_start:
case Intrinsic::lifetime_end:
+ // The donothing intrinsic does, well, nothing.
+ case Intrinsic::donothing:
return true;
+
case Intrinsic::dbg_declare: {
const DbgDeclareInst *DI = cast<DbgDeclareInst>(Call);
if (!DIVariable(DI->getVariable()).Verify() ||