[GPGPU] Fix #includes.

Adapt for 05da2fe52162 "Sink all InitializePasses.h includes" which
forgot the GPGPU files (presumably because POLLY_ENABLE_GPGPU_CODEGEN
is OFF by default).

GitOrigin-RevId: 2c831971bf9670cd4b5b40c06983845eeffc7245
2 files changed