fix Issue 12902 - [ICE] Assertion failure '!ae->lengthVar' in 'expression.c' when using `opDollar`
fix Issue 12904 - Wrong-code for some slice to slice assignments when using `opDollar`
Merge pull request #3668 from 9rnsr/fix12902

Issue 12902 & 10904 - fix ICEs with opDollar and multidimensional operator overloading