[DNM] Comply `SymbolGraph.SemanticVersion` to SemVer 2.0.0#36

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WowbaggersLiquidLunch wants to merge 9 commits intoswiftlang:mainfrom

WowbaggersLiquidLunch:semantic-version

Commits on May 26, 2022

comply `SymbolGraph.SemanticVersion` to SemVer 2.0.0
WowbaggersLiquidLunch
committed

Commits on May 27, 2022

revert the main swift version specifier back to “5.2”
WowbaggersLiquidLunch
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elaborate a bit more on why we cannot omit empty subsequences when splitting the prerelease into identifiers

WowbaggersLiquidLunch
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d-ronnqvist
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use the convenient computed property `isAllowedInSemanticVersionIdentifier` when validating build metadata

WowbaggersLiquidLunch
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d-ronnqvist
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defer assignment to `position`-prefixed constants to inside the switch statements
WowbaggersLiquidLunch
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move common identifier validation logic out of `Prerelease.swift`
WowbaggersLiquidLunch
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add a non-throwing initializer that takes only version core identifiers
WowbaggersLiquidLunch
committed

Commits on Jun 4, 2022