[scudo] Fix missing pushing 1 block to BatchClassId

This was happened rarely. The only case is when a thread is teared down
and it only has one block of BatchClass and the freelist of BatchClass
is empty. The impact is leaking 1 block of BatchClass and which is minor.

Differential Revision: https://reviews.llvm.org/D149141

GitOrigin-RevId: c266bfe278bb586ddb03111c6656d5fe3a2ad554
1 file changed