Null initialize a few variables flagged by
clang's -Wuninitialized-experimental warning.
While these don't look like real bugs, clang's
-Wuninitialized-experimental analysis is stricter
than GCC's, and these fixes have the benefit
of being general nice cleanups.

llvm-svn: 124072
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 7c6d9d91..62adcf9 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -2888,7 +2888,7 @@
     }
   }
   
-  bool isExplicitSpecialization;
+  bool isExplicitSpecialization = false;
   VarDecl *NewVD;
   if (!getLangOptions().CPlusPlus) {
       NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(),