Improve babel parse speed

[fisker]

• I’ve added tests to confirm my change works.
• (If changing the API or CLI) I’ve documented the changes I’ve made (in the docs/ directory)
• (If the change is user-facing) I’ve added my changes to changelog_unreleased/*/pr-XXXX.md file following changelog_unreleased/TEMPLATE.md.
• I’ve read the contributing guidelines.

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[pull-assistant]

Best reviewed: with all changes

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Optimal code review plan (4 commits squashed)

Improve babel parse ... ... Fix tests

Squashed 4 commits:

• Improve babel parse speed

• Enable more tests

• Cleanup

• Fix tests

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[todo]

this is not enabled

prettier/src/language-js/parser-babel.js

Lines 67 to 72 in 7fc3435

	// TODO: this is not enabled
	// {
	// name: "exportNamespaceFrom",
	// test(text) {
	// return text.includes("export") && text.includes("as") && text.includes("from");
	// },

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This comment was generated by todo based on a TODO comment in 7fc3435 in #378. cc @fisker.

[todo]

enable this

prettier/src/language-js/parser-babel.js

Lines 144 to 149 in 7fc3435

	// TODO: enable this
	// {
	// name: "jsx",
	// test(text) {
	// return /<\/|\/>/.test(text);
	// },

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This comment was generated by todo based on a TODO comment in 7fc3435 in #378. cc @fisker.