[lld] [llvm] Add initial support for Xtensa to LLD (PR #202926)

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``````````diff
--- lit.cfg.py	2026-06-10 10:41:53.000000 +0000
+++ lit.cfg.py	2026-06-10 10:50:41.842128 +0000
@@ -97,11 +97,11 @@
                 "RISCV": "riscv",
                 "Sparc": "sparc",
                 "SystemZ": "systemz",
                 "WebAssembly": "wasm",
                 "X86": "x86",
-                'Xtensa': 'xtensa',
+                "Xtensa": "xtensa",
             },
         ),
         ("--assertion-mode", {"ON": "asserts"}),
     ]
 )

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https://github.com/llvm/llvm-project/pull/202926