[clang][ssaf] Consolidate tools and shared utilities under `clang/tools/clang-ssaf/` This patch extracts the shared code between `clang-ssaf-format` and `clang-ssaf-linker` into a new `clangScalableStaticAnalysisFrameworkTool` library at `clang/lib/ScalableStaticAnalysisFramework/Tool/`, with the public header at `clang/include/clang/ScalableStaticAnalysisFramework/Tool/Utils.h`. This shared library provides: - `fail()` overloads for fatal error reporting - `initTool()` — sets the tool name and version, configures the version printer, hides unrelated command-line options, and parses arguments - `getToolName()` — accessor for the tool name set by `initTool()` - `loadPlugins()` — loads plugin shared libraries from a list of paths - `getFormatForExtension()` — cached format-registry lookup - `SummaryFile` — resolves a file path to its serialization format - `ErrorMessages` — shared diagnostic string constants Tool-specific error strings remain in a `LocalErrorMessages` namespace in each tool's anonymous namespace. Binary names and locations (`bin/clang-ssaf-format`, `bin/clang-ssaf-linker`) are unchanged.
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