perf(ext/ffi): optimize synchronous calls

[littledivy]

This commit implements an optimization
for blocking FFI calls.

op_ffi_load creates JS functions for
synchronous symbols. This avoids
reallocations that existed in op_ffi_call
and allows future V8 fast API optimizations.

Each function owns an allocation to corresponding
the Symbol, which is freed on GC.

Nonblocking ops & statics are still registered JS
side and use ops to make calls.

[bartlomieju]

LGTM, these are very impressive results

[lucacasonato]

I want to discuss this in CLI design meeting, because it bypasses ops.

[lucacasonato]

Also unintentional SWC downgrade?

[aapoalas]

Taking Fast API into usage will require using FunctionTemplate which means that the function's lifetime becomes tied to the isolate, ie. un-GC'able.

This doesn't mean it shouldn't necessarily be done but probably does mean that it should be opt-out'able.

[bartlomieju]

Also unintentional SWC downgrade?

How so?

[bartlomieju]

#14945 (comment)

[lucacasonato]

How so?

Look at cli/Cargo.toml

[bartlomieju]

How so?

Look at cli/Cargo.toml

I see only two changed files

[lucacasonato]

Huh, on the GitHub mobile app I see a bunch more changed files. I guess must be a bug. It looks correct on the website... sorry for the noise.