Add support for compile jobs that read source input from standard input.

[artemcm]

This change uses Process input handling added in swiftlang/swift-tools-support-core#208 to allow forwarding of the driver's Standard Input to a frontend job.

Resolves rdar://76454784

[artemcm]

@swift-ci please test

[artemcm]

@swift-ci please test

[artemcm]

@shahmishal, the CI log says it is pulling swift-tools-support-core from main, but the build fails as if swiftlang/swift-tools-support-core#208 hasn't been merged. Am I missing something in how this works?

[shahmishal]

@swift-ci please test

[shahmishal]

Its running on clean workspace, let me log in and check the sha.

[shahmishal]

  {
        "package": "swift-tools-support-core",
        "repositoryURL": "https://github.com/apple/swift-tools-support-core.git",
        "state": {
          "branch": "main",
          "revision": "207f9c6bc5e33eb8383266c0cd3129c1276f534b",
          "version": null
        }
      }

[artemcm]

"revision": "207f9c6bc5e33eb8383266c0cd3129c1276f534b",

Right, this is quite old so if it's resolved to this commit then it makes sense why it doesn't work.

[artemcm]

@swift-ci please test