[BOLT] Introduce binary analysis tool based on BOLT (#115330)

This initial commit does not add any specific binary analyses yet, it
merely contains the boilerplate to introduce a new BOLT-based tool.

This basically combines the 4 first patches from the prototype pac-ret
and stack-clash binary analyzer discussed in RFC
https://discourse.llvm.org/t/rfc-bolt-based-binary-analysis-tool-to-verify-correctness-of-security-hardening/78148
and published at
https://github.com/llvm/llvm-project/compare/main...kbeyls:llvm-project:bolt-gadget-scanner-prototype

The introduction of such a BOLT-based binary analysis tool was proposed
and discussed in at least the following places:
- The RFC pointed to above
- EuroLLVM 2024 round table
https://discourse.llvm.org/t/summary-of-bolt-as-a-binary-analysis-tool-round-table-at-eurollvm/78441
The round table showed quite a few people interested in being able to
build a custom binary analysis quickly with a tool like this.
- Also at the US LLVM dev meeting a few weeks ago, I heard interest from
a few people, asking when the tool would be available upstream.
- The presentation "Adding Pointer Authentication ABI support for your
ELF platform"
(https://llvm.swoogo.com/2024devmtg/session/2512720/adding-pointer-authentication-abi-support-for-your-elf-platform)
explicitly mentioned interest to extend the prototype tool to verify
correct implementation of pauthabi.

1 files changed, 2 insertions, 0 deletions

diff --git a/bolt/lib/Utils/CommandLineOpts.cpp b/bolt/lib/Utils/CommandLineOpts.cpp
index de82420..17f090a 100644
--- a/bolt/lib/Utils/CommandLineOpts.cpp
+++ b/bolt/lib/Utils/CommandLineOpts.cpp
@@ -29,6 +29,7 @@ const char *BoltRevision =
 namespace opts {
 
 bool HeatmapMode = false;
+bool BinaryAnalysisMode = false;
 
 cl::OptionCategory BoltCategory("BOLT generic options");
 cl::OptionCategory BoltDiffCategory("BOLTDIFF generic options");
@@ -38,6 +39,7 @@ cl::OptionCategory BoltOutputCategory("Output options");
 cl::OptionCategory AggregatorCategory("Data aggregation options");
 cl::OptionCategory BoltInstrCategory("BOLT instrumentation options");
 cl::OptionCategory HeatmapCategory("Heatmap options");
+cl::OptionCategory BinaryAnalysisCategory("BinaryAnalysis options");
 
 cl::opt<unsigned> AlignText("align-text",
                             cl::desc("alignment of .text section"), cl::Hidden,