C++: Extract the expanded compiler arguments

[jketema]

No description provided.

[Copilot]

Pull Request Overview

This PR adds support for extracting expanded compiler arguments from response files. When compilers receive arguments like @someFile, they expand the contents of that file. The new compilation_expanded_args table and corresponding QL predicates allow queries to access these expanded arguments.

Key changes:

• Added compilation_expanded_args table to the database schema for storing expanded compilation arguments
• Introduced getAnExpandedArgument() and getExpandedArgument(int i) predicates to the Compilation class
• Provided upgrade/downgrade migration paths for database schema compatibility

Reviewed Changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
cpp/ql/lib/upgrades/2121ffec11fac265524955fee1775217364d4ca4/upgrade.properties	Defines upgrade metadata for backward compatibility
cpp/ql/lib/upgrades/2121ffec11fac265524955fee1775217364d4ca4/semmlecode.cpp.dbscheme	New schema version with compilation_expanded_args table
cpp/ql/lib/upgrades/2121ffec11fac265524955fee1775217364d4ca4/old.dbscheme	Previous schema version without expanded args support
cpp/ql/lib/semmlecode.cpp.dbscheme	Updated main schema with new compilation_expanded_args table
cpp/ql/lib/semmle/code/cpp/Compilation.qll	Added predicates to access expanded arguments
cpp/ql/lib/change-notes/2025-11-13-expanded.md	Documents the new feature for release notes
cpp/downgrades/1a6854060d5d3ada16c580a29f8c5ce21f3367f8/upgrade.properties	Downgrade configuration to remove expanded args table
cpp/downgrades/1a6854060d5d3ada16c580a29f8c5ce21f3367f8/semmlecode.cpp.dbscheme	Schema for downgrade without expanded args

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