Vendor import of llvm r114020 (from the release_28 branch):

http://llvm.org/svn/llvm-project/llvm/branches/release_28@114020

Approved by:	rpaulo (mentor)

1 files changed, 16 insertions, 3 deletions

diff --git a/lib/VMCore/Use.cpp b/lib/VMCore/Use.cpp
index b7fd92f..fec710b 100644
--- a/lib/VMCore/Use.cpp
+++ b/lib/VMCore/Use.cpp
@@ -86,14 +86,27 @@ const Use *Use::getImpliedUser() const {
 //===----------------------------------------------------------------------===//
 
 Use *Use::initTags(Use * const Start, Use *Stop, ptrdiff_t Done) {
+  while (Done < 20) {
+    if (Start == Stop--)
+      return Start;
+    static const PrevPtrTag tags[20] = { fullStopTag, oneDigitTag, stopTag,
+                                         oneDigitTag, oneDigitTag, stopTag,
+                                         zeroDigitTag, oneDigitTag, oneDigitTag,
+                                         stopTag, zeroDigitTag, oneDigitTag,
+                                         zeroDigitTag, oneDigitTag, stopTag,
+                                         oneDigitTag, oneDigitTag, oneDigitTag,
+                                         oneDigitTag, stopTag
+                                       };
+    Stop->Prev.setFromOpaqueValue(reinterpret_cast<Use**>(tags[Done++]));
+    Stop->Val = 0;
+  }
+
   ptrdiff_t Count = Done;
   while (Start != Stop) {
     --Stop;
     Stop->Val = 0;
     if (!Count) {
-      Stop->Prev.setFromOpaqueValue(reinterpret_cast<Use**>(Done == 0
-                                                            ? fullStopTag
-                                                            : stopTag));
+      Stop->Prev.setFromOpaqueValue(reinterpret_cast<Use**>(stopTag));
       ++Done;
       Count = Done;
     } else {