child_process: add fast path for spawn

[ronag]

No description provided.

[ronag]

https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/1661/

[ronag]

Unrelated CI benchmark failure...

10:42:39 ../src/node_config_file.h:35:32: error: ‘simdjson’ has not been declared
10:42:39    35 |   ParseResult ParseNodeOptions(simdjson::ondemand::object* node_options_object);
10:42:39       |                                ^~~~~~~~
10:42:39 ../src/node_config_file.h:35:58: error: expected ‘,’ or ‘...’ before ‘*’ token
10:42:39    35 |   ParseResult ParseNodeOptions(simdjson::ondemand::object* node_options_object);
10:42:39       |                                                          ^
10:42:39 make[1]: *** [libnode.target.mk:510: /w/bnch-comp/node/out/Release/obj.target/libnode/src/node.o] Error 1

Who's a good ping on that? @nodejs/benchmarking

[atlowChemi]

ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/1661

https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/1662/

                                   confidence improvement accuracy (*)   (**)  (***)
child_process/spawn-echo.js n=1000        ***     16.87 %       ±1.27% ±1.69% ±2.21%

Be aware that when doing many comparisons the risk of a false-positive
result increases. In this case, there are 1 comparisons, you can thus
expect the following amount of false-positive results:
  0.05 false positives, when considering a   5% risk acceptance (*, **, ***),
  0.01 false positives, when considering a   1% risk acceptance (**, ***),
  0.00 false positives, when considering a 0.1% risk acceptance (***)

[aduh95]

nit: I find the commit message a bit confusing, our guidelines asks for the first word to be an imperative verb, which "spawn" is, but is not used as such here. My suggestion would be child_process: add fast path for `spawn`

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/65426/