Commits on Oct 13, 2020

1. [ClassicFlang][Driver] Reduce downstream delta …

   This commit is motivated by reducing the merge burden by shrinking the
   diff between llvm upstream and classic-flang-llvm-project.
   
   Outside of Flang, Fortran code is fed through the Compile phase, and
   the appropriate tooling is picked up through ToolChain::SelectTool.
   
   Classic Flang introduced a FortranFrontend, but these days this seems
   unnecessary. Fortran can go through the same machinery as everything else.
   
   * Use the Preprocess phase to preprocess Fortran code. This phase is
     always combined with the Compile phase.
   
   * Use the Compile phase to lower Fortran code to LLVM IR, and use the
     Backend phase to compile and optimize the IR. These phases are never
     combined.
   
   * Remove FortranFrontendJobClass.
   
   * Remove FortranFrontend tool (instead it's just the Flang tool, which
     in Classic Flang mode is Classic Flang).
   
   * Update tests which inspect the output of the Classic Flang tooling,
     and ensures that the driver does the right thing for various types of
     inputs.
   
   Based on a patch from Peter Waller <peter.waller@arm.com>.

   

   bryanpkc committed Oct 13, 2020
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