Just FYI, I have been finally able to successfully build Swift 5.1 toolchain end to end on PowerPC64LE with the current 'swift-5.1-branch' tree, including all the test suites.
I also manually verified the build against the steps mentioned at "https://swift.org/getting-started/"
Also I was able to run the entire Kitura test suite on this build (https://github.com/IBM-Swift/Kitura)
I have raised PR to create CI jobs for building swift-5.1-branch test suites at https://github.com/apple/swift-community-hosted-continuous-integration/pull/19
Just wanted to thank all the Swift community members for all their help, support and patience in guiding me in this activity. :)
Thanks & Regards,