[PATCH GCC]Refine comment and set type for partition merged from SCC

[Richard Biener]

On Wed, Oct 11, 2017 at 6:10 PM, Bin Cheng <Bin.Cheng@arm.com> wrote:
> Hi,
> When reading the code I found it's could be confusing without comment.
> This patch adds comment explaining why we want merge PARALLEL type
> partitions in a SCC, even though the result partition can no longer
> be executed in parallel.  It also sets type of the result partition
> to sequential.
> Bootstrap and test on x86_64 and AArch64.  Is it OK?

Ok.

Richard.

> Thanks,
> bin
> 2017-10-10  Bin Cheng  <bin.cheng@arm.com>
>
>         * tree-loop-distribution.c (break_alias_scc_partitions): Add comment
>         and set PTYPE_SEQUENTIAL for merged partition.