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06e9bbc3a6
Replace the two-key TBlockStmt(Py::AstNode parent, string slot) newtype
branch with the simpler TBlockStmt(Py::StmtList sl). Each Py::StmtList
that represents an imperative block (function/class/module body, if/
while/for branch, try/except/finally body, case body, except/except*
body) becomes one BlockStmt directly. The slot string disappears;
toString just defers to Py::StmtList.toString() ('StmtList').
The newtype branch keeps an explicit characteristic predicate listing
the slots that count as block bodies. This excludes Try.getHandlers(),
which is a Py::StmtList of ExceptStmt items already iterated by the
shared library's Try logic via getCatch(int) - including it would
produce parallel CFG edges (verified: a permissive
TBlockStmt(Py::StmtList sl) version regressed CPython to 1720
multipleSuccessors and 584 deadEnds before this restriction).
Drops the getBodyStmtList helper. Caller sites now use the StmtList
accessor directly: TBlockStmt(ifStmt.getBody()),
TBlockStmt(tryStmt.getFinalbody()), etc.
No behaviour change: all 24 NewCfg evaluation-order tests pass; all
11 shared-CFG consistency queries report 0 violations on CPython.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>