[wasm] Option to implement OCaml strings with JavaScript strings

[vouillon]

• Conditional compilation of Wasm runtime
• Import string constants (define JS strings in Wasm runtime)
• default should be not to use js strings
• Compatibilty for when JS string builtins proposal is not available
• Performance improvements
  • skip conversions for ASCII strings
  • lower level version of caml_blit_string
  • Use I16 array for conversions
  • Remove unnecessary conversion
• clean-up / check for missing tests
• adapt Jane street libraries
• performance measurements

[Copilot]

Copilot reviewed 59 out of 59 changed files in this pull request and generated no comments.

[vouillon]

Suggested change

	not
	(String.equal module_ ""
	|| List.mem ~eq:String.equal module_ allowed_imports))
	not (List.mem ~eq:String.equal module_ allowed_imports))

[OlivierNicole]

Shouldn’t it be:

Suggested change

	not
	(String.equal module_ ""
	|| List.mem ~eq:String.equal module_ allowed_imports))
	not
	(String.equal module_ "str"
	|| List.mem ~eq:String.equal module_ allowed_imports))

But even then I’m getting errors…

[vouillon]

You should update the list of allowed imports in compile.ml instead.