Re: RFA: Fix PR38785

[Joern Rennecke]

Quoting Joern Rennecke <amylaar@xxxxxxxxxxx>:
> different incoming edges.  In rtl it should be obvious that inserting
> expensive constant loads in each of the blocks of the postdominance
> frontier in order to eliminate a simple ALU operation is not a good

Oops, make that inserting expensive constant loads in each incoming edge.
But it's still a bad idea.

Plus, if-conversion should already removed the most blatant causes of
tree-ssa-pre code explosion.