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phpctx: tighten RegisterClass no-op to require same case-sensitive name

The same-class-pointer no-op (which lets VM-compiled script bodies
re-execute class declarations without erroring) accidentally
swallowed the alias-redeclare warning for
\`class_alias('foo', 'FOO')\`: the pointer matches the existing
registration, but the case-sensitive name differs (foo vs FOO),
which PHP wants to warn about.

Require both same pointer AND same case-sensitive name for the
no-op. Fixes class_alias_002 and class_alias_019 phpt — the last
two VM-only regressions.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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