devel/llvm-devel: New snapshot

Add support for COMPILER_RT on powerpc*. [0]

Don't enable MLIR by default. Instead, rely on FLANG's dependency
on it to turn it on for architectures that support FLANG. This removes
MLIR from default packages on 32-bit system.

PR: 263803 [0]
Submitted by: pkubaj [0]