fix IR

Author: GYT

llvm/test/Transforms/LoopVectorize/diag-disabled-vectorization-msgs.ll

@@ -50,7 +50,7 @@ entry:
 loop:
   %iv = phi i64 [ 0, %entry ], [ %inc, %loop ]
   %arrayidx = getelementptr inbounds nuw double, ptr %src, i64 %iv
-  store double 0, ptr %arrayidx, align 8
+  store double 0.0, ptr %arrayidx, align 8
   %inc = add nuw nsw i64 %iv, 1
   %exitcond.not = icmp eq i64 %inc, 15
   br i1 %exitcond.not, label %exit, label %loop, !llvm.loop !0