rts: Flush eventlog in hs_init_ghc (fixes #15440)
Without this change RTS typically doesn't flush some important events until the process terminates or it doesn't write them at all in case it terminates abnormally. Here is a list of such events: * EVENT_WALL_CLOCK_TIME * EVENT_OS_PROCESS_PID * EVENT_OS_PROCESS_PPID * EVENT_RTS_IDENTIFIER * EVENT_PROGRAM_ARGS * EVENT_PROGRAM_ENV
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