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[Dexter] Add support for Windows to regression test suite.

Authored by TWeaver on Mar 31 2020, 2:18 AM.

Description

[Dexter] Add support for Windows to regression test suite.

This patch addresses the issue of the regression suite not running on windows
hardware. It changes the following things:

  • add new dexter regression suite command to lit.cfg.py that makes use of the clang-cl_vs2015 and dbgend builder and debuggers.
  • sprinkle the new regressionsuite command through the feature and tool tests that require them.
  • mark certain problem tests on windows
  • [revert fix] fixed darwin regression test failures by adding unsupported line for system-darwin to command tests.

There's a couple of tests that fail (or pass) in unexpected ways on Windows.

Problem tests are both the penalty and perfect expect_watch_type.cpp tests.
Type information reporting parity is not possible a this time in dexter due to
the nature of how different debuggers report type information back to their users.

reviewers: Orlando

Differential Revision: https://reviews.llvm.org/D76609

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