WIP fix: handle assignments to dereferenced pointer values #2971

Job	Run time
build (1.20.x, GOARCH=amd64 GOOS=linux, gno)	17s
test (1.20.x, _test.cmd)	57s
build (1.20.x, GOARCH=wasm GOOS=js, gno)	27s
test (1.20.x, _test.pkg)	39s
build (1.21.x, GOARCH=amd64 GOOS=linux, gno)	25s
test (1.20.x, _test.gnolang.native)	32s
build (1.21.x, GOARCH=wasm GOOS=js, gno)	27s
test (1.20.x, _test.gnolang.stdlibs)	54s
test (1.20.x, _test.gnolang.realm)	24s
test (1.20.x, _test.gnolang.pkg0)	1m 35s
test (1.20.x, _test.gnolang.pkg1)	6m 32s
test (1.20.x, _test.gnolang.pkg2)	4m 0s
test (1.20.x, _test.gnolang.other)	19s
test (1.21.x, _test.cmd)	1m 1s
test (1.21.x, _test.pkg)	31s
test (1.21.x, _test.gnolang.native)	20s
test (1.21.x, _test.gnolang.stdlibs)	52s
test (1.21.x, _test.gnolang.realm)	24s
test (1.21.x, _test.gnolang.pkg0)	1m 30s
test (1.21.x, _test.gnolang.pkg1)	6m 4s
test (1.21.x, _test.gnolang.pkg2)	3m 55s
test (1.21.x, _test.gnolang.other)	23s
upload-coverage	22s
	32m 50s

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