[llvm] [orc-rt] Generalize testcases for different target archs (PR #222629)

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``````````diff
--- lit.cfg.py	2026-09-10 12:34:25.000000 +0000
+++ lit.cfg.py	2026-09-10 12:38:31.044227 +0000
@@ -91,7 +91,6 @@
     config.substitutions.append(("%macos-product-version", platform.mac_ver()[0]))
 config.substitutions.append(("%target_triple", config.target_triple))
 
 # The architecture the runtime was built for, so tests can check the triple it
 # reports against an independent source.
-config.substitutions.append(
-    ("%target-arch", config.target_triple.split("-")[0]))
+config.substitutions.append(("%target-arch", config.target_triple.split("-")[0]))

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https://github.com/llvm/llvm-project/pull/222629