re-integrate stack trace tests with the new std.Build API

* RunStep: ability to set stdin
 * RunStep: ability to capture stdout and stderr as a FileSource
 * RunStep: add setName method
 * RunStep: hash the stdio checks
a24af8e400Andrew Kelley committed on 3/15/2023, 5:48:13 PMparent7bad695
7 files changedLine totals unavailable