[llvm] [mlgo] add 2 new features whether caller/callee is `available_externally` (PR #96585)

[via llvm-commits]

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``````````bash
darker --check --diff -r 4e0a0eae58f7a6998866719f7eb970096a2a52e9...7a9c3f8ce1be5877e56b605e5dd695d767fb7279 llvm/lib/Analysis/models/gen-inline-oz-test-model.py
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``````````diff
--- gen-inline-oz-test-model.py	2024-06-25 03:10:22.000000 +0000
+++ gen-inline-oz-test-model.py	2024-06-25 03:17:49.493187 +0000
@@ -70,11 +70,11 @@
             "is_multiple_blocks",
             "nested_inlines",
             "nested_inline_cost_estimate",
             "threshold",
             "is_callee_avail_external",
-            "is_caller_avail_external"
+            "is_caller_avail_external",
         ]
     ]
 
     # float32 features
     inputs.extend(

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https://github.com/llvm/llvm-project/pull/96585