[OpenMP] Use the assertion formatting from assert.h

This patch changes the `assert_assume` function used for internal
assumptions in the device runtime to use a more standard formatting for
the assumption message.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D112842

GitOrigin-RevId: 2c6a4e5678c286c8b1129d66ccf24a828a6a0414
2 files changed