fix(gnolang): fix panic when using struct as index of map #5279

Job	Run time
build (1.21.x, GOARCH=amd64 GOOS=linux, gno)	22s
build (1.21.x, GOARCH=wasm GOOS=js, gno)	28s
test (1.21.x, _test.cmd)	1m 22s
build (1.22.x, GOARCH=amd64 GOOS=linux, gno)	19s
build (1.22.x, GOARCH=wasm GOOS=js, gno)	25s
test (1.21.x, _test.pkg)	46s
test (1.21.x, _test.gnolang.native)	25s
test (1.21.x, _test.gnolang.stdlibs)	48s
test (1.21.x, _test.gnolang.realm)	37s
test (1.21.x, _test.gnolang.pkg0)	1m 55s
test (1.21.x, _test.gnolang.pkg1)	6m 22s
test (1.21.x, _test.gnolang.pkg2)	4m 20s
test (1.21.x, _test.gnolang.other)	25s
test (1.22.x, _test.cmd)	1m 18s
test (1.22.x, _test.pkg)	44s
test (1.22.x, _test.gnolang.native)	24s
test (1.22.x, _test.gnolang.stdlibs)	49s
test (1.22.x, _test.gnolang.realm)	29s
test (1.22.x, _test.gnolang.pkg0)	1m 47s
test (1.22.x, _test.gnolang.pkg1)	6m 22s
test (1.22.x, _test.gnolang.pkg2)	3m 59s
test (1.22.x, _test.gnolang.other)	25s
upload-coverage	17s
	35m 8s

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