Fix GCC warning:
  lib/CodeGen/RegAllocGreedy.cpp:311: error: unused variable 'PhysReg' [-Wunused-variable]


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122122 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/RegAllocGreedy.cpp b/lib/CodeGen/RegAllocGreedy.cpp
index 12a1cfc..50e4546 100644
--- a/lib/CodeGen/RegAllocGreedy.cpp
+++ b/lib/CodeGen/RegAllocGreedy.cpp
@@ -310,6 +310,7 @@
   for (unsigned i = 0, e = SplitLoops.size(); i != e; ++i) {
     if (unsigned PhysReg = findInterferenceFreeReg(SplitLoops[i],
                                                    VirtReg, Order)) {
+      (void)PhysReg;
       Loop = SplitLoops[i];
       DEBUG(dbgs() << "  " << TRI->getName(PhysReg)
                    << " has no interferences in " << *Loop << '\n');