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Apply LLVM IR PGO to C/C++ in fbcode builds Summary: Only rustc honored `llvm-ir-pgo`, so C/C++ linked into a pgo'd rust binary was neither instrumented nor optimized with the profile. The fbcode clang toolchain now adds `-fprofile-generate` in generate builds, and `-fprofile-use` with the binary's `llvm_ir_pgo` profile in use builds. One capture covers both languages since rustc and clang write t…