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Add separators between files in LLVM IR dumps (#7463)
Each file dump now starts with a `; ---` comment and ends with a blank line. This makes it easier to visually scan the dump for a file of interest. The comment format is somewhat arbitrary; I chose `---` to align with the `--- filename.carbon` separator in SemIR dumps, but without the filename, because that appears on each of the next two lines already.
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@@ -308,8 +308,10 @@ auto CompilationUnit::RunOptimize(
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auto CompilationUnit::PostLower() -> void {
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CARBON_CHECK(module_, "Must call RunLower first");
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if (options_->dump_llvm_ir && IncludeInDumps()) {
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*driver_env_->output_stream << "; ---\n";
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module_->print(*driver_env_->output_stream, /*AAW=*/nullptr,
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/*ShouldPreserveUseListOrder=*/true);
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*driver_env_->output_stream << "\n";
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}
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}
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