Swift REPL doesn't support swiftbuild build system

[cmcgee1024]

Is it reproducible with SwiftPM command-line tools: swift build, swift test, swift package etc?

• Confirmed reproduction steps with SwiftPM CLI. The description text must include reproduction steps with either of command-line SwiftPM commands, swift build, swift test, swift package etc.

Description

The Swift REPL entry point in SwiftRunCommand directly invokes the native build system, and uses the build plan, which is specific to that build system, to create the REPL arguments. Instead, it should be possible to configure the build system to Swift Build, and then the REPL arguments created independently from a build plan. The REPL arguments are mostly derived from the ModulesGraph, and BuildParameters so this should be feasible.

Expected behavior

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Actual behavior

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Steps to reproduce

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Swift Package Manager version/commit hash

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Swift & OS version (output of swift --version ; uname -a)

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