[rtsan] Added mmap and shm interceptors (#114862) # Why do we think these are unsafe? mmap and munmap are used for mapping a specific manipulation of the virtual memory of a process. Typically used in things like databases and area allocators. They call the system calls `mmap` and `munmap` under the hood (confirmed on mac using dtrace) shm_open/unlink interact with shared memory across processes. Similarly under the hood, they call the `shm_open`/`shm_unlink` system calls (confirmed on mac using dtrace)
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