[Backend] Bump to llvm/llvm-project@3963d2148292 (triton-lang#6094)

antiagainst · loislo · commit 1142944005cf · 2025-03-04T16:43:00.000+01:00
This brings in the following for attention kernel perf: * llvm/llvm-project#127133
diff --git a/cmake/llvm-hash.txt b/cmake/llvm-hash.txt
@@ -1 +1 @@
-a66376b0dc3b2ea8a84fda26faca287980986f78
+3963d2148292145543cf83b13ff839a63995fdc2
