ZJIT: Refine singleton class invariant to only invalidate on method shadowing #12676

Job	Run time
make (check, --disable-yjit)	7m 47s
make (check, --enable-shared --enable-load-relative)	8m 22s
make (check, cppflags=-DVM_CHECK_MODE)	9m 26s
make (test-bundler-parallel, 50)	23m 32s
make (test-bundled-gems)	20m 52s
ruby-bench (--warmup=1 --bench=1 --excludes=shipit)	15m 5s
make (check, ubuntu-24.04, capi)	11m 35s
make (check, i686)	11m 16s
make-ibm	0s
Ubuntu result	4s
	1h 47m 59s

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