Go: migrate control flow graph to shared CFG library#21614

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Commits on May 13, 2026

The shared CFG library instantiation for Go compiles cleanly. Let me show you the current state of the file:
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Phase 1 — Complete. The shared CFG library is now instantiated and wired into Go:
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All 90 queries compile cleanly. Here's the status:
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Checkpoint from VS Code for cloud agent session
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Continue shared CFG library migration: fix prologue/epilogue, implicit fields, cleanup

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Fix overlay annotation in ControlFlowGraphShared.qll

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Fix compiler errors and warnings: remove redundant type checks and isIn guards, mark implicitFieldSelection as additional

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Add File as a CFG root to support file-level declarations

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Add missing QLdoc comments to IR.qll classes, predicates, and newtype branches

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Fix shared Go CFG expression and return-edge regressions

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Add GotoStmt, Parameter, Throw, Assignment and PatternMatchExpr to Go Ast module for updated shared CFG AstSig

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Fix overlay annotation in PrintAst.qll
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Add go/print-cfg
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Create cfg node for child of ParenExpr
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