[llvm] Add assertions to to check dominator tree is not called on empty functions (PR #167428)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- llvm/include/llvm/CodeGen/MachineFunction.h llvm/lib/CodeGen/MachineDominators.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/include/llvm/CodeGen/MachineFunction.h b/llvm/include/llvm/CodeGen/MachineFunction.h
index cc924e79f..cf0d7ad17 100644
--- a/llvm/include/llvm/CodeGen/MachineFunction.h
+++ b/llvm/include/llvm/CodeGen/MachineFunction.h
@@ -1495,7 +1495,7 @@ template <> struct GraphTraits<MachineFunction*> :
   static NodeRef getEntryNode(MachineFunction *F) {
     assert(!F->empty() && "No entry node for an empty function");
     return &F->front();
-	}
+  }
 
   // nodes_iterator/begin/end - Allow iteration over all nodes in the graph
   using nodes_iterator = pointer_iterator<MachineFunction::iterator>;

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https://github.com/llvm/llvm-project/pull/167428