Use SmallVectorImpl& instead of SmallVector to avoid repeating small vector size.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@186284 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaStmt.cpp b/lib/Sema/SemaStmt.cpp
index 107eed3..5502a04 100644
--- a/lib/Sema/SemaStmt.cpp
+++ b/lib/Sema/SemaStmt.cpp
@@ -1216,13 +1216,13 @@
   // of the excluded constructs are used.
   class DeclExtractor : public EvaluatedExprVisitor<DeclExtractor> {
     llvm::SmallPtrSet<VarDecl*, 8> &Decls;
-    SmallVector<SourceRange, 10> &Ranges;
+    SmallVectorImpl<SourceRange> &Ranges;
     bool Simple;
   public:
     typedef EvaluatedExprVisitor<DeclExtractor> Inherited;
 
     DeclExtractor(Sema &S, llvm::SmallPtrSet<VarDecl*, 8> &Decls,
-                  SmallVector<SourceRange, 10> &Ranges) :
+                  SmallVectorImpl<SourceRange> &Ranges) :
         Inherited(S.Context),
         Decls(Decls),
         Ranges(Ranges),