[llvm] [llvm-rc] Don't interpret integer literals as octal numbers in rc.exe mode (PR #166915)

[Alexandre Ganea via llvm-commits]

aganea wrote:

> > LGTM. Does this deserve a release notes entry?
> 
> Not sure; I guess this is a fairly obscure bugfix...
> 
> What do you think about backporting this to 21.x? It's a quite safe change to make, but we're also quite late in the 21.x cycle.

Yes we can port it.

https://github.com/llvm/llvm-project/pull/166915