Fix SmallVector's resize() method (#4979)

A resize from a large amount to a small amount would sometimes not clear
the flexible storage, if we used it before but not after.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/support/small_vector.h b/src/support/small_vector.h
index e2c865b8f..7c03ae02b 100644
--- a/src/support/small_vector.h
+++ b/src/support/small_vector.h
@@ -116,6 +116,8 @@ public:
     usedFixed = std::min(N, newSize);
     if (newSize > N) {
       flexible.resize(newSize - N);
+    } else {
+      flexible.clear();
     }
   }