Build(deps): Bump terser and broccoli-uglify-sourcemap

[dependabot]

Bumps terser and broccoli-uglify-sourcemap. These dependencies needed to be updated together.
Updates terser from 3.17.0 to 4.8.1

Changelog

Sourced from terser's changelog.

v4.8.1 (backport)

• Security fix for RegExps that should not be evaluated (regexp DDOS)

v4.8.0

• Support for numeric separators (million = 1_000_000) was added.
• Assigning properties to a class is now assumed to be pure.
• Fixed bug where yield wasn't considered a valid property key in generators.

v4.7.0

• A bug was fixed where an arrow function would have the wrong size
• arguments object is now considered safe to retrieve properties from (useful for length, or 0) even when pure_getters is not set.
• Fixed erroneous const declarations without value (which is invalid) in some corner cases when using collapse_vars.

v4.6.13

• Fixed issue where ES5 object properties were being turned into ES6 object properties due to more lax unicode rules.
• Fixed parsing of BigInt with lowercase e in them.

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.

... (truncated)

Commits

• 40674a4 update changelog, version
• d8cc569 backport fix to potential regexp DDOS
• 504b967 4.8.0
• 9f380dc update changelog
• 7dd0b9d update assumptions
• cfad907 Allow yield to be used as property key in generators.
• 283f44f Make class property assignment pure.
• ee965e8 Add numeric separators support (#725)
• ee6b8af 4.7.0
• 807f729 update changelog
• Additional commits viewable in compare view

Updates broccoli-uglify-sourcemap from 3.1.0 to 3.2.0

Release notes

Sourced from broccoli-uglify-sourcemap's releases.

Release 3.2.0

v3.2.0 (2019-10-18)

🚀 Enhancement

• #176 Build(deps): Bump terser from 3.17.0 to 4.3.9 (@​dependabot-preview[bot])
• #166 Support .mjs extension (@​chadhietala)

Committers: 2

• Chad Hietala (@​chadhietala)
• @​dependabot-preview[bot]

Changelog

Sourced from broccoli-uglify-sourcemap's changelog.

v3.2.0 (2019-10-18)

🚀 Enhancement

• #176 Build(deps): Bump terser from 3.17.0 to 4.3.9 (@​dependabot-preview[bot])
• #166 Support .mjs extension (@​chadhietala)

Committers: 2

• Chad Hietala (@​chadhietala)
• @​dependabot-preview[bot]

v3.1.1 (2019-04-16)

• Fix sources: ["0"], output the correct source (@​xg-wang)

Commits

• b08642c Release 3.2.0
• 0b6ddf5 Merge branch 'master' of github.com:ember-cli/broccoli-uglify-sourcemap
• cb49daa Merge pull request #175 from ember-cli/dependabot/npm_and_yarn/workerpool-5.0.1
• 22d0244 Add v3.2.0 to CHANGELOG.md
• 8b3a6c2 Build(deps): Bump workerpool from 3.1.2 to 5.0.1
• 1094371 Build(deps): Bump terser from 3.17.0 to 4.3.9 (#176)
• c6b1643 Build(deps): Bump terser from 3.17.0 to 4.3.9
• 625ea7a Support .mjs extension (#166)
• b521e6b Support .mjs extension
• de1ef5d Build(deps): [Security] Bump mixin-deep from 1.3.1 to 1.3.2
• Additional commits viewable in compare view

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