[llvm] [AArch64][CodeGen] Add +lsfe atomicrmw tests where the result is unused. (PR #132022)

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``````````bash
darker --check --diff -r 75ab43b70eef125dbdf1586143fad88a2a61170e...068e156b5869b914495cd71deaf5b13609c254ce llvm/test/CodeGen/AArch64/Atomics/generate-tests.py
``````````

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View the diff from darker here.
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``````````diff
--- generate-tests.py	2025-03-19 13:22:43.000000 +0000
+++ generate-tests.py	2025-03-19 13:31:18.036798 +0000
@@ -188,25 +188,25 @@
     fp = os.path.relpath(__file__, os.path.abspath(os.path.join(__file__, top)))
     return fp
 
 
 def generate_unused_res_test(featname, ordering, op, alignval):
-  if featname != 'lsfe' or op == 'fsub' or alignval == 1:
-    return False
-  if ordering not in [AtomicOrder.monotonic, AtomicOrder.release]:
-    return False
-  return True;
+    if featname != "lsfe" or op == "fsub" or alignval == 1:
+        return False
+    if ordering not in [AtomicOrder.monotonic, AtomicOrder.release]:
+        return False
+    return True
 
 
 def align(val, aligned: bool) -> int:
     return val if aligned else 1
 
 
 def all_atomicrmw(f, datatype, atomicrmw_ops, featname):
     instr = "atomicrmw"
-    generate_unused = False;
-    tests = [];
+    generate_unused = False
+    tests = []
     for op in atomicrmw_ops:
         for aligned in Aligned:
             for ty, val in datatype:
                 alignval = align(val, aligned)
                 for ordering in ATOMICRMW_ORDERS:
@@ -220,30 +220,32 @@
                         }}
                     """
                         )
                     )
                     if generate_unused_res_test(featname, ordering, op, alignval):
-                        generate_unused = True;
+                        generate_unused = True
                         name = f"atomicrmw_{op}_{ty}_{aligned}_{ordering}_unused"
                         tests.append(
-                           textwrap.dedent(
-                               f"""
+                            textwrap.dedent(
+                                f"""
                            define dso_local void @{name}(ptr %ptr, {ty} %value) {{
                                %r = {instr} {op} ptr %ptr, {ty} %value {ordering}, align {alignval}
                                ret void
                            }}
                         """
-                           )
+                            )
                         )
 
     if generate_unused:
-      f.write("\n; NOTE: '_unused' tests are added to ensure we do not lower to "
-              "ST[F]ADD when the destination register is WZR/XZR.\n"
-              "; See discussion on https://github.com/llvm/llvm-project/pull/131174\n")
+        f.write(
+            "\n; NOTE: '_unused' tests are added to ensure we do not lower to "
+            "ST[F]ADD when the destination register is WZR/XZR.\n"
+            "; See discussion on https://github.com/llvm/llvm-project/pull/131174\n"
+        )
 
     for test in tests:
-      f.write(test)
+        f.write(test)
 
 
 def all_load(f):
     for aligned in Aligned:
         for ty, val in Type:

``````````

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https://github.com/llvm/llvm-project/pull/132022