[clang] [flang] [llvm] Add IR Profile-Guided Optimization (IR PGO) support to the Flang compiler (PR #136098)

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+! Tests for -fprofile-generate and -fprofile-use flag compatibility. These two
+! flags behave similarly to their GCC counterparts:
+!
+! -fprofile-generate         Generates the profile file ./default.profraw
+! -fprofile-use=<dir>/file   Uses the profile file <dir>/file
+
+! On AIX, -flto used to be required with -fprofile-generate. gcc-flag-compatibility-aix.c is used to do the testing on AIX with -flto
+! RUN: %flang %s -c -S -o - -emit-llvm -fprofile-generate | FileCheck -check-prefix=PROFILE-GEN %s
+! PROFILE-GEN: @__profc_{{_?}}main = {{(private|internal)}} global [1 x i64] zeroinitializer, section
+! PROFILE-GEN: @__profd_{{_?}}main =
+
+
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fanju110 wrote:

It's okay, I referenced clang for this file, and I adjusted the code layout to keep it looking nice

https://github.com/llvm/llvm-project/pull/136098