Clarified assert text.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147471 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index 1e58173..9ee7c0b 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -646,7 +646,7 @@
                                  SmallVectorImpl<MachineInstr*> *dead) {
   DEBUG(dbgs() << "Shrink: " << *li << '\n');
   assert(TargetRegisterInfo::isVirtualRegister(li->reg)
-         && "Can't only shrink physical registers");
+         && "Can only shrink virtual registers");
   // Find all the values used, including PHI kills.
   SmallVector<std::pair<SlotIndex, VNInfo*>, 16> WorkList;