ScopDetect: Allow multiplications of the form <param> * <param>

We handle these by treating this result of the multiplication as an additional
parameter.

llvm-svn: 179163
diff --git a/polly/lib/Support/SCEVValidator.cpp b/polly/lib/Support/SCEVValidator.cpp
index d5b4a34..a739f3b 100644
--- a/polly/lib/Support/SCEVValidator.cpp
+++ b/polly/lib/Support/SCEVValidator.cpp
@@ -208,6 +208,11 @@
       if (Op.isINT())
         continue;
 
+      if (Op.isPARAM() && Return.isPARAM()) {
+        Return.merge(Op);
+        continue;
+      }
+
       if ((Op.isIV() || Op.isPARAM()) && !Return.isINT()) {
         DEBUG(dbgs() << "INVALID: More than one non-int operand in MulExpr\n"
                      << "\tExpr: " << *Expr << "\n"