[llvm] [NVPTX] Add support for ldmatrix extensions introduced in PTX 9.4 (PR #224264)

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darker --check --diff -r origin/main...HEAD llvm/test/CodeGen/NVPTX/wmma-ptx94-sm90a.py llvm/test/CodeGen/NVPTX/wmma.py
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``````````diff
--- wmma.py	2026-09-17 10:59:07.000000 +0000
+++ wmma.py	2026-09-17 11:10:05.696264 +0000
@@ -423,11 +423,12 @@
         make_ldmatrix_ops(["m8n8"], ["x1", "x2", "x4"], ["b16"])
         + make_ldmatrix_ops(
             ["m16n16"], ["x1", "x2"], ["b8", "b8x16.b6x16_p32", "b8x16.b4x16_p64"]
         )
         + make_ldmatrix_ops(
-            ["m8n16"], ["x1", "x2", "x4"],
+            ["m8n16"],
+            ["x1", "x2", "x4"],
             ["b8x16.b6x16_p32", "b8x16.b4x16_p64", "s8.s4"],
         )
     )
 
 

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https://github.com/llvm/llvm-project/pull/224264