Don’t set SWIFT_BUILD_SCRIPT_ENVIRONMENT when building swift-format
#630
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Setting `SWIFT_BUILD_SCRIPT_ENVIRONMENT` entails that we e.g. enable assertions in swift-syntax, even in release mode, which we don’t want since the copy of swift-format that we include in the toolchain is also built using this script and shouldn’t have these swift-syntax’s assertions enabled, to improve performance.
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Setting
SWIFT_BUILD_SCRIPT_ENVIRONMENTentails that we e.g. enable assertions in swift-syntax, even in release mode, which we don’t want since the copy of swift-format that we include in the toolchain is also built using this script and shouldn’t have these swift-syntax’s assertions enabled, to improve performance.