[llvm] [ctx_prof] Extend `WorkloadImportsManager` to use the contextual profile (PR #98682)

[Teresa Johnson via llvm-commits]

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@@ -174,6 +174,10 @@ static cl::opt<std::string> WorkloadDefinitions(
              "}"),
     cl::Hidden);
 
+static cl::opt<std::string>
+    ContextualProfile("thinlto-pgo-ctx-prof",
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teresajohnson wrote:

I meant a lit test. I think it would be good to add (reading the binary format like I am assuming the ctx profile reader tests do?), otherwise this is untested functionality.

https://github.com/llvm/llvm-project/pull/98682