13018ef3b4
Adds `examples/ffi-jni-call-03-methodid-sharing.sx` with two `#jni_call` sites against the same (class, method, sig). Today each site emits its own `GetObjectClass` + `GetMethodID` + `Call<Type>Method` sequence (8 vtable indirections total for the two-call test); 1.17 will collapse the two `GetMethodID` calls into a single cached `jmethodID` static slot populated at module init, mirroring the `OBJC_SELECTOR_REFERENCES_*` shape that 1.5 introduced for `#objc_call`. Runtime is a no-op — `unused_jni` is reachable through a runtime-readable `g_should_call` global that stays false, so the JNI dereferences never execute. A plain `if false` would get constant-folded, taking the function definition out of the IR entirely; the global keeps both the function and its body present for the IR-snapshot harness. IR snapshot at `tests/expected/ffi-jni-call-03-methodid-sharing.ir` locks the pre-caching shape. The next commit (1.17) updates it to the collapsed shape. 113/113 host tests pass.
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