[Bug target/106015] [PowerPC] pointer to MMA accumulator not convertible to char pointer

[bergner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106015

--- Comment #3 from Peter Bergner <bergner at gcc dot gnu.org> ---
I think we just want to remove the entire section in
rs6000_invalid_conversion() that checks the XOmode/OOmode pointer conversions. 
Doing that fixes the ICE and fixes the PR106015 ICE too.  I'm doing a bootstrap
and regtest of that patch now.