RFR: JDK-8297731: Remove redundant check in MutableBigInteger.divide

[Andrey Turbanov]

On Mon, 28 Nov 2022 18:58:29 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> Remove redundant code reported in
> 
> https://mail.openjdk.org/pipermail/core-libs-dev/2022-November/097163.html

IDEA now highlights unnecessary `rem.offset=1` assignments, which are above modified code.
Now we always overwrite it with `0` anyway.

https://github.com/openjdk/jdk/blob/6f06f440bcf8a5db379b80e8765af38a15449356/src/java.base/share/classes/java/math/MutableBigInteger.java#L1498
https://github.com/openjdk/jdk/blob/6f06f440bcf8a5db379b80e8765af38a15449356/src/java.base/share/classes/java/math/MutableBigInteger.java#L1504
https://github.com/openjdk/jdk/blob/6f06f440bcf8a5db379b80e8765af38a15449356/src/java.base/share/classes/java/math/MutableBigInteger.java#L1520

Perhaps we can drop them too.

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PR: https://git.openjdk.org/jdk/pull/11395