Use size_t type when shifting bits
Use size_t type when shifting bits

A bare "1" is a 32-bit number, which can't be safely shifted far enough
to cover bits in size_t.

PiperOrigin-RevId: 259382542
Change-Id: I7422030e366f7055e7feb31d1b5d98f80b0e1217

google/asylo,google/asylo,google/asylo,google/asylo,google/asylo,google/asylo