[sanitizer] Remove unused 32-bit allocator TransferBatch parameter

Summary:
NFC. Remove an unused parameter in
`SizeClassAllocator32::TransferBatch::SetFromArray`, and thus get rid of the
compilation warning.

Reviewers: alekseyshl, vitalybuka

Reviewed By: vitalybuka

Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits

Differential Revision: https://reviews.llvm.org/D46397

llvm-svn: 331477