blockfreq: Use a std::list for Loops

As pointed out by David Blaikie in code review, a `std::list<T>` is
simpler than a `std::vector<std::unique_ptr<T>>`.  Another option is a
`std::deque<T>` (which allocates in chunks), but I'd like to leave open
the option of inserting in the middle of the sequence for handling
irreducible control flow on the fly.

<rdar://problem/14292693>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207177 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/Analysis/BlockFrequencyInfoImpl.cpp b/lib/Analysis/BlockFrequencyInfoImpl.cpp
index 29a4117c13..42c674983c 100644
--- a/lib/Analysis/BlockFrequencyInfoImpl.cpp
+++ b/lib/Analysis/BlockFrequencyInfoImpl.cpp
@@ -602,7 +602,7 @@ void BlockFrequencyInfoImplBase::clear() {
   // does not actually clear heap storage.
   std::vector<FrequencyData>().swap(Freqs);
   std::vector<WorkingData>().swap(Working);
-  std::vector<std::unique_ptr<LoopData>>().swap(Loops);
+  Loops.clear();
 }
 
 /// \brief Clear all memory not needed downstream.