[Bug #20992] Test for local variable name encodings #625

Job	Run time
make (check, cppflags=-DVM_CHECK_MODE)	8m 26s
make (check, i686)	10m 2s
make (check, --disable-yjit)	7m 1s
make (check, --enable-shared --enable-load-relative)	7m 34s
make (test-bundler-parallel, 50)	26m 42s
make (test-bundled-gems)	15m 54s
make (check, ubuntu-20.04)	9m 41s
make (check, ubuntu-24.04)	8m 39s
Ubuntu result	1s
	1h 34m 0s

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