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[ORC] Add a LLJITWithThinLTOSummaries example in OrcV2Examples

Authored by sgraenitz on Aug 14 2020, 8:03 AM.

Description

[ORC] Add a LLJITWithThinLTOSummaries example in OrcV2Examples

The example demonstrates how to use a module summary index file produced for ThinLTO to:

  • find the module that defines the main entry point
  • find all extra modules that are required for the build

A LIT test runs the example as part of the LLVM test suite [1] and shows how to create a module summary index file.
The code also provides two Error types that can be useful when working with ThinLTO summaries.

[1] if LLVM_BUILD_EXAMPLES=ON and platform is not Windows

Differential Revision: https://reviews.llvm.org/D85974