[AVX] Unique UnsetInit

Keep only one UnsetInit around.

llvm-svn: 136487
diff --git a/llvm/utils/TableGen/Record.cpp b/llvm/utils/TableGen/Record.cpp
index 17fe2fa..0f50df6 100644
--- a/llvm/utils/TableGen/Record.cpp
+++ b/llvm/utils/TableGen/Record.cpp
@@ -443,7 +443,8 @@
 void Init::dump() const { return print(errs()); }
 
 const UnsetInit *UnsetInit::get() {
-  return new UnsetInit;
+  static const UnsetInit TheInit;
+  return &TheInit;
 }
 
 const BitInit *BitInit::get(bool V) {