Matthias Braun 740ee00a4c PPCBranchCoalescing: Fix invalid branch weights (#67211) ...

Re-normalize branch-weights after removing a block successor to avoid
branch-weights not adding up to 100%. This changes MIR for the
`test/CodeGen/PowerPC/branch_coalesce.ll` test like this:

```diff
-  successors: %bb.6(0x40000000); %bb.6(50.00%)
+  successors: %bb.6(0x80000000); %bb.6(100.00%)
```

This doesn't affect codegen on its own but fixing this helps with
fluctuations I have with some of my upcoming changes.

2023-09-25 10:41:04 -07:00

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