Fix a bug: if buffer pool size > 2 GB on a 32-bit computer, we got an assertion failure because >> acted as a division operator (not as a register shift) for a wrapped-over integer value


innobase/include/buf0buf.ic:
  Fix a bug: if buffer pool size > 2 GB on a 32-bit computer, we got an assertion failure because >> acted as a division operator (not as a register shift) for a wrapped-over integer value