perf(codegen): getter arm only for declared getter names; one decline block per untyped index store

[proggeramlug]

Refs #11784, Refs #10516.

• Getter arm: a read site emits the class-getter arm only for a name some compiled class declares as a getter. This is the read-side half of perf(codegen): a store emits the class-setter arm only for a name a compiled class declares as a setter #11859.
• Index stores: an untyped obj[i] = v store sends both its typed-array tier and its Array tier to one shared fallback block, so the Uint8Array byte arm and the full runtime store are emitted once per site, not twice.

	main	head
tsc binary	181.5 MB	173.4 MB
tsc instructions (n=5)	—	+0.09% (noise)
tsc full collections	238	238
RSS	—	+0.1%

Zod, qs, commander and hello are flat, and their output matches node. Matrix (583 cells): per-op averages fall (inherited −11, addkey −2.3); 68 cells are better and 45 worse by 2–6 instructions from register allocation and layout, with the same hit-path work. Runtime 4845/0 (--test-threads=1), codegen tests pass, and the getter/setter/accessor/class gap subset passes 163/163.

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📒 Files selected for processing (8)

• changelog.d/PENDING-dynarr-one-decline.md
• changelog.d/PENDING-getter-arm-names.md
• crates/perry-codegen/src/codegen/opts.rs
• crates/perry-codegen/src/expr/barrier_stem_census_tests.rs
• crates/perry-codegen/src/expr/index_set_typed_array.rs
• crates/perry-codegen/src/expr/mod.rs
• crates/perry-codegen/src/expr/property_get/generic_dispatch.rs
• crates/perry-codegen/src/expr/property_get/tests.rs

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