Use false for bool instead of 0

llvm-svn: 271562
diff --git a/llvm/lib/CodeGen/VirtRegMap.cpp b/llvm/lib/CodeGen/VirtRegMap.cpp
index c064fd5..7713adb 100644
--- a/llvm/lib/CodeGen/VirtRegMap.cpp
+++ b/llvm/lib/CodeGen/VirtRegMap.cpp
@@ -82,7 +82,7 @@
 bool VirtRegMap::hasPreferredPhys(unsigned VirtReg) {
   unsigned Hint = MRI->getSimpleHint(VirtReg);
   if (!Hint)
-    return 0;
+    return false;
   if (TargetRegisterInfo::isVirtualRegister(Hint))
     Hint = getPhys(Hint);
   return getPhys(VirtReg) == Hint;