PackageModel, CoreCommands: fix build flags not passed #6380
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Motivation:
When computing
SwiftTool/_buildParameters
, command-line options that customizeBuildFlags
values are not merged withBuildFlags
from the computed toolchain/destination.rdar://106077959
Modifications:
Added
mutating func append(_: BuildFlags)
on theBuildFlags
type for easier merging of multiple values into one, which is then used inSwiftTool/_buildParameters
.