[llvm] [CodeGen] Place unsplittable blocks after the profiled blocks in BB sections (PR #228173)

[Rahman Lavaee via llvm-commits]

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@@ -286,6 +297,10 @@ assignSections(MachineFunction &MF,
           // BB goes into the special cold section if it is not specified in the
           // cluster info map.
           MBB.setSectionID(MBBSectionID::ColdSectionID);
+        } else if (BBSectionsSinkUnsplittableBlocksToEnd) {
+          // Otherwise, it stays in the default section, after all the profiled
+          // basic blocks of that section.
+          MBB.setSectionID(MBBSectionID(0));
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rlavaee wrote:

Thanks. Removed and added comment to explain.

https://github.com/llvm/llvm-project/pull/228173