[Support][JSON] Add reserve() to json Array

Summary:
Space reservation increases json lib performance for the arrays with large number of entries.
Here is the example and discussion: https://reviews.llvm.org/D60609#1468941

Reviewers: lebedev.ri, sammccall

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D60788

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358520 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/Support/JSON.h b/include/llvm/Support/JSON.h
index e3cb950663232d0df6aa93bb184da86a6cde3370..b2aaf68724d6c5481ad3b28622bcefb00b30e4fb 100644 (file)
--- a/include/llvm/Support/JSON.h
+++ b/include/llvm/Support/JSON.h
@@ -179,6 +179,7 @@ public:
 
   bool empty() const { return V.empty(); }
   size_t size() const { return V.size(); }
+  void reserve(size_t S) { V.reserve(S); }
 
   void clear() { V.clear(); }
   void push_back(const Value &E) { V.push_back(E); }