Bump terser from 4.3.9 to 4.6.12

[dependabot-preview]

Bumps terser from 4.3.9 to 4.6.12.

Changelog

Sourced from terser's changelog.

v4.6.12

• Fixed subtree comparison code, making it see that [1,[2, 3]] is different from [1, 2, [3]]
• Printing of unicode identifiers has been improved

v4.6.11

• Read unused classes' properties and method keys, to figure out if they use other variables.
• Prevent inlining into block scopes when there are name collisions
• Functions are no longer inlined into parameter defaults, because they live in their own special scope.
• When inlining identity functions, take into account the fact they may be used to drop this in function calls.
• Nullish coalescing operator (x ?? y), plus basic optimization for it.
• Template literals in binary expressions such as + have been further optimized

v4.6.10

• Do not use reduce_vars when classes are present

v4.6.9

• Check if block scopes actually exist in blocks

v4.6.8

• Take into account "executed bits" of classes like static properties or computed keys, when checking if a class evaluation might throw or have side effects.

v4.6.7

• Some new performance gains through a AST_Node.size() method which measures a node's source code length without printing it to a string first.
• An issue with setting --comments to false in the CLI has been fixed.
• Fixed some issues with inlining
• unsafe_symbols compress option was added, which turns Symbol("name") into just Symbol()
• Brought back compress performance improvement through the AST_Node.equivalent_to(other) method (which was reverted in v4.6.6).

v4.6.6

(hotfix release)

• Reverted code to 4.6.4 to allow for more time to investigate an issue.

v4.6.5 (REVERTED)

• Improved compress performance through using a new method to see if two nodes are equivalent, instead of printing them to a string.

v4.6.4

• The "some" value in the comments output option now preserves @lic and other important comments when using //
• </script> is now better escaped in regex, and in comments, when using the inline_script output option
• Fixed an issue when transforming new RegExp into /.../ when slashes are included in the source
• AST_Node.prototype.constructor now exists, allowing for easier debugging of crashes

... (truncated)

Commits

• 4f161d7 4.6.12
• 3729fae lint
• ea01f7d update changelog
• 7fda1de further fix the equivalent-to fix
• 5d25b74 remove output errors
• 2743c71 fix the equivalent_to fix
• 743d032 add a marker between nodes while recursively comparing them in equivalent_to.
• 49a0f52 update documentation to reflect fact that domprops was merged into builtins
• 0529bf2 Add assumption
• acdef9d Merge branch 'master' of github.com:terser/terser
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #97.