[RewriteStatepointsForGC] Fix debug assertion during derivable pointe…

…r rematerialization

Correct assertion would be that there is no other uses from chain we are currently cloning. It is ok to have other uses of values not from this chain.

Differential Revision: http://reviews.llvm.org/D9882

llvm-svn: 237899

llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp

@@ -1944,12 +1944,12 @@ static void rematerializeLiveValues(CallSite CS,
           assert(LastValue);
           ClonedValue->replaceUsesOfWith(LastValue, LastClonedValue);
 #ifndef NDEBUG
-          // Assert that cloned instruction does not use any instructions
-          // other than LastClonedValue
-          for (auto OpValue: ClonedValue->operand_values()) {
-            if (isa<Instruction>(OpValue))
-              assert(OpValue == LastClonedValue &&
-                     "unexpected use found in rematerialized value");
+          // Assert that cloned instruction does not use any instructions from
+          // this chain other than LastClonedValue
+          for (auto OpValue : ClonedValue->operand_values()) {
+            assert(std::find(ChainToBase.begin(), ChainToBase.end(), OpValue) ==
+                       ChainToBase.end() &&
+                   "incorrect use in rematerialization chain");
           }
 #endif
         }