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syscall: implement rawVforkSyscall for remaining linux platforms
This allows the use of CLONE_VFORK and CLONE_VM for fork/exec, preventing 'fork/exec ...: cannot allocate memory' failures from occuring when attempting to execute commands from a Go process that has a large memory footprint. Additionally, this should reduce the latency of fork/exec on these platforms. Fixes #31936 Change-Id: I4e28cf0763173145cacaa5340680dca9ff449305 Reviewed-on: https://go-review.googlesource.com/c/go/+/295849 Trust: Joel Sing <joel@sing.id.au> Run-TryBot: Joel Sing <joel@sing.id.au> Reviewed-by: Cherry Zhang <cherryyz@google.com>
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