[llvm] [ADT] Mark BitVector::find_prev_unset const (NFC) (PR #156272)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-adt

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>

find_prev_unset calls find_last_unset_in, a const method, but
find_prev_unset itself isn't marked const.


---
Full diff: https://github.com/llvm/llvm-project/pull/156272.diff


1 Files Affected:

- (modified) llvm/include/llvm/ADT/BitVector.h (+1-1) 


``````````diff
diff --git a/llvm/include/llvm/ADT/BitVector.h b/llvm/include/llvm/ADT/BitVector.h
index 70de4c239c1c7..1fbce1a95fb76 100644
--- a/llvm/include/llvm/ADT/BitVector.h
+++ b/llvm/include/llvm/ADT/BitVector.h
@@ -327,7 +327,7 @@ class BitVector {
 
   /// find_prev_unset - Returns the index of the first unset bit that precedes
   /// the bit at \p PriorTo.  Returns -1 if all previous bits are set.
-  int find_prev_unset(unsigned PriorTo) {
+  int find_prev_unset(unsigned PriorTo) const {
     return find_last_unset_in(0, PriorTo);
   }
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/156272