fix: short-circuit //=, ||=, &&= in bytecode interpreter, parser disambiguation, DBI last_insert_id

[fglock]

Summary

Three fixes for DBIx::Class test failures:

• //=, ||=, &&= short-circuit in bytecode interpreter: The bytecode compiler (used by eval STRING) was eagerly evaluating the RHS before checking the short-circuit condition. Side effects like $result_pos++ always executed, breaking DBIx::Class's eval-generated row collapser code where //= deduplicates joined rows during prefetch result collapsing. Added handleShortCircuitAssignment() that compiles LHS first, emits conditional jump (GOTO_IF_TRUE/GOTO_IF_FALSE) to skip RHS, and only evaluates and assigns via SET_SCALAR when needed.

• Parser {} disambiguation inside %{...} dereference context: %{{ map { ... } @list }} was parsed as a block instead of a hash reference when inside a dereference context. Added insideDereference flag to Parser so isHashLiteral() defaults to hash when there are no block indicators. Fixes RowParser.pm __unique_numlist and Ordered.pm values %{{ ... }} patterns.

• DBI last_insert_id() connection-level queries: Replaced statement-level getGeneratedKeys() with connection-level SQL (SELECT last_insert_rowid() for SQLite, etc.). The old approach broke when any prepare() call between INSERT and last_insert_id() overwrote the stored statement handle.

DBIx::Class tests fixed

• t/83cache.t test 7: prefetch collapsing now returns 3 unique artists instead of 5 raw joined rows
• t/90join_torture.t test 4: "Two artists returned" now returns 2 collapsed artists instead of 12
• t/79aliasing.t: no longer crashes on %{{ map {...} @list }} parsing
• t/87ordered.t: no longer crashes on values %{{ ... }} parsing
• t/101populate_rs.t: last_insert_id + parser fix unblocks this test

Files changed

File	Change
BytecodeCompiler.java	Refactored handleCompoundAssignment() to defer RHS evaluation for //=, `
Parser.java	Added insideDereference flag
StatementResolver.java	isHashLiteral() checks insideDereference flag
Variable.java	parseBracedVariable() sets insideDereference before parsing
DBI.java	last_insert_id() uses connection-level SQL queries
dev/modules/dbix_class.md	Updated with steps 5.35-5.37

Test plan

• make passes (all unit tests)
• //= short-circuits correctly in eval (isolated test)
• ||= and &&= short-circuit correctly in eval
• Non-eval //=/||=/&&= still works (JVM backend unaffected)
• DBIx::Class t/83cache.t test 7 passes
• DBIx::Class t/90join_torture.t test 4 passes

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