Update re2

third_party/re2/patches/re2-msan.patch

-diff --git a/third_party/re2/util/sparse_array.h b/third_party/re2/util/sparse_array.h
-index 3e33f89..4ee5c94 100644
---- a/third_party/re2/util/sparse_array.h
-+++ b/third_party/re2/util/sparse_array.h
-@@ -231,7 +231,8 @@ class SparseArray {
- 
- template<typename Value>
- SparseArray<Value>::SparseArray()
--    : size_(0), max_size_(0), sparse_to_dense_(NULL), dense_(), valgrind_(RunningOnValgrind()) {}
-+    : size_(0), max_size_(0), sparse_to_dense_(NULL), dense_(),
-+      valgrind_(RunningOnValgrindOrMemorySanitizer()) {}
- 
- // IndexValue pairs: exposed in SparseArray::iterator.
- template<typename Value>
-@@ -418,7 +419,7 @@ void SparseArray<Value>::create_index(int i) {
- template<typename Value> SparseArray<Value>::SparseArray(int max_size) {
-   max_size_ = max_size;
-   sparse_to_dense_ = new int[max_size];
--  valgrind_ = RunningOnValgrind();
-+  valgrind_ = RunningOnValgrindOrMemorySanitizer();
-   dense_.resize(max_size);
-   // Don't need to zero the new memory, but appease Valgrind.
-   if (valgrind_) {
-diff --git a/third_party/re2/util/sparse_set.h b/third_party/re2/util/sparse_set.h
-index 165dd09..4a324d7 100644
---- a/third_party/re2/util/sparse_set.h
-+++ b/third_party/re2/util/sparse_set.h
-@@ -54,13 +54,14 @@ namespace re2 {
- class SparseSet {
-  public:
-   SparseSet()
--    : size_(0), max_size_(0), sparse_to_dense_(NULL), dense_(NULL), valgrind_(RunningOnValgrind()) {}
-+    : size_(0), max_size_(0), sparse_to_dense_(NULL), dense_(NULL),
-+      valgrind_(RunningOnValgrindOrMemorySanitizer()) {}
- 
-   SparseSet(int max_size) {
-     max_size_ = max_size;
-     sparse_to_dense_ = new int[max_size];
-     dense_ = new int[max_size];
--    valgrind_ = RunningOnValgrind();
-+    valgrind_ = RunningOnValgrindOrMemorySanitizer();
-     // Don't need to zero the memory, but do so anyway
-     // to appease Valgrind.
-     if (valgrind_) {
-diff --git a/third_party/re2/util/util.h b/third_party/re2/util/util.h
-index de1ef5b..49159c2 100644
---- a/third_party/re2/util/util.h
-+++ b/third_party/re2/util/util.h
-@@ -129,6 +129,14 @@ static inline uint64 Hash64StringWithSeed(const char* s, int len, uint32 seed) {
-   return ((uint64)x << 32) | y;
- }
- 
-+inline bool RunningOnValgrindOrMemorySanitizer() {
-+#if defined(MEMORY_SANITIZER)
-+  return true;
-+#else
-+  return RunningOnValgrind();
-+#endif
-+}
-+
- }  // namespace re2
- 
- #include "util/arena.h"