keytype := decodetypeMapKey(d.ldr, d.arch, gotype)
		valtype := decodetypeMapValue(d.ldr, d.arch, gotype)
		keydata := d.ldr.Data(keytype)
		valdata := d.ldr.Data(valtype)
		keysize, valsize := decodetypeSize(d.arch, keydata), decodetypeSize(d.arch, valdata)
		keytype, valtype = d.walksymtypedef(d.defgotype(keytype)), d.walksymtypedef(d.defgotype(valtype))

		// compute size info like hashmap.c does.
		indirectKey, indirectVal := false, false