[llvm] [BasicBlockSections] Allow mixing of -basic-block-sections with MFS. (PR #117076)

[Aiden Grossman via llvm-commits]

================
@@ -128,6 +129,9 @@ static bool isColdBlock(const MachineBasicBlock &MBB,
 }
 
 bool MachineFunctionSplitter::runOnMachineFunction(MachineFunction &MF) {
+  // Do not split functions when -basic-block-sections=all is specified.
+  if (MF.getTarget().getBBSectionsType() == llvm::BasicBlockSection::All)
+    return false;
----------------
boomanaiden154 wrote:

For mapping, we just use the basic block address map rather than basic block sections as we only need to know where blocks are and their size rather than any ability to rearrange/GC them in the linker.

https://github.com/llvm/llvm-project/pull/117076