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

[Mircea Trofin via llvm-commits]

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+; Test workload based importing via -thinlto-pgo-ctx-prof
+; Use external linkage symbols so we don't depend on module paths which are
+; used when computing the GUIDs of internal linkage symbols.
+; The functionality is shared with what workload.ll tests, so here we only care
+; about testing the ctx profile is loaded and handled correctly.
+;
+; Set up
+; RUN: rm -rf %t
+; RUN: mkdir -p %t
+; RUN: split-file %s %t
+;
+; RUN: opt -module-summary %t/m1.ll -o %t/m1.bc
+; RUN: opt -module-summary %t/m2.ll -o %t/m2.bc
+; RUN: llvm-dis %t/m1.bc -o - | FileCheck %s --check-prefix=GUIDS-1
+; RUN: llvm-dis %t/m2.bc -o - | FileCheck %s --check-prefix=GUIDS-2
+;
+; GUIDS-1: name: "m1_f1"
+; GUIDS-1-SAME: guid = 6019442868614718803
+; GUIDS-2: name: "m2_f1"
+; GUIDS-2-SAME: guid = 15593096274670919754
+;
+; RUN: rm -rf %t_baseline
+; RUN: rm -rf %t_exp
+; RUN: mkdir -p %t_baseline
+; RUN: mkdir -p %t_exp
+;
+; Normal run. m1 shouldn't get m2_f1 because it's not referenced from there.
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mtrofin wrote:

yup

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