Do not consider mem intrinsics as error.

The intrinsics memset, memcopy and memmove do have their memory accesses
modeled by ScopBuilder. Do not consider them error-case behavior.

Test case will come with a future patch that requires memory intrinsics
outside of error blocks.

llvm-svn: 312021

polly/lib/Support/ScopHelper.cpp

@@ -415,6 +415,10 @@ bool polly::isErrorBlock(BasicBlock &BB, const Region &R, LoopInfo &LI,
       if (isIgnoredIntrinsic(CI))
         continue;
 
+      // memset, memcpy and memmove are modeled intrinsics.
+      if (isa<MemSetInst>(CI) || isa<MemTransferInst>(CI))
+        continue;
+
       if (!CI->doesNotAccessMemory())
         return true;
       if (CI->doesNotReturn())