Add assert and remove unnecessary checks

Author: steplong

llvm/lib/CodeGen/PreISelIntrinsicLowering.cpp

@@ -594,8 +594,8 @@ bool PreISelIntrinsicLowering::lowerIntrinsics(Module &M) const {
           return false;
         const TargetLowering *TL = TM->getSubtargetImpl(F)->getTargetLowering();
         unsigned Op = TL->IntrinsicIDToISD(F.getIntrinsicID());
-        if (Op == ISD::DELETED_NODE ||
-            !TL->isOperationExpand(Op, EVT::getEVT(Ty)))
+        assert(Op != ISD::DELETED_NODE && "unsupported intrinsic");
+        if (!TL->isOperationExpand(Op, EVT::getEVT(Ty)))
           return false;
         return lowerUnaryVectorIntrinsicAsLoop(M, CI);
       });

llvm/test/Transforms/PreISelIntrinsicLowering/AArch64/expand-log.ll

@@ -37,6 +37,4 @@ define <4 x float> @fixed_vec_log(<4 x float> %input) {
 declare <4 x float> @llvm.log.v4f32(<4 x float>) #0
 declare <vscale x 4 x float> @llvm.log.nxv4f32(<vscale x 4 x float>) #0
 
-; CHECK: attributes #0 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
-; CHECK-NEXT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(none) }
 attributes #0 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }