[llvm] [MachineOutliner] Leaf Descendants (PR #90275)

[Kyungwoo Lee via llvm-commits]

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+; This test is mainly for the -outliner-leaf-descendants flag for MachineOutliner.
+;
+; ===================== -outliner-leaf-descendants=false =====================
+; MachineOutliner finds THREE key `OutlinedFunction` and outlines them. They are:
+;   ```
+;     mov     w0, #1
+;     mov     w1, #2
+;     mov     w2, #3
+;     mov     w3, #4
+;     mov     w4, #5
+;     mov     w5, #6 or #7 or #8
+;     b
+;   ```
+; Each has:
+;   - `SequenceSize=28` and `OccurrenceCount=2`
+;   - each Candidate has `CallOverhead=4` and `FrameOverhead=0`
+;   - `NotOutlinedCost=28*2=56` and `OutliningCost=4*2+28+0=36`
+;   - `Benefit=56-36=20` and `Priority=56/36=1.56`
+;
+; ===================== -outliner-leaf-descendants=true =====================
+; MachineOutliner finds a FOURTH key `OutlinedFunction`, which is:
+;   ```
+;   mov     w0, #1
+;   mov     w1, #2
+;   mov     w2, #3
+;   mov     w3, #4
+;   mov     w4, #5
+;   ```
+; This corresponds to an internal node that has ZERO leaf children, but SIX leaf descendants.
+; It has:
+;   - `SequenceSize=20` and `OccurrenceCount=6`
+;   - each Candidate has `CallOverhead=12` and `FrameOverhead=4`
+;   - `NotOutlinedCost=20*6=120` and `OutliningCost=12*6+20+4=96`
+;   - `Benefit=120-96=24` and `Priority=120/96=1.25`
+;
+; The FOURTH `OutlinedFunction` has lower _priority_ compared to the first THREE `OutlinedFunction`
+; Hence, if we additionally include the `-sort-per-priority` flag,  the first THREE `OutlinedFunction` are outlined.
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kyulee-com wrote:

Do we have `-sort-per-priority` flag?

https://github.com/llvm/llvm-project/pull/90275