[LV] Make the new getter return a const reference. NFC

LoopVectorizationLegality holds a constant reference to LAI, so this
will have to be const as well.

Also added missed function comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272851 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Vectorize/LoopVectorize.cpp b/lib/Transforms/Vectorize/LoopVectorize.cpp
index a5eedc9ff052703685e3734a163f3abddf5f1642..2fbd9725dbd3da248994c7e041f3cca87a86ef0b 100644 (file)
--- a/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -1448,7 +1448,9 @@ private:
     emitAnalysisDiag(TheFunction, TheLoop, *Hints, Message);
   }
 
-  ValueToValueMap &getSymbolicStrides() { return SymbolicStrides; }
+  /// \brief If an access has a symbolic strides, this maps the pointer value to
+  /// the stride symbol.
+  const ValueToValueMap &getSymbolicStrides() { return SymbolicStrides; }
 
   unsigned NumPredStores;