[Backend] Bump to llvm/llvm-project@3963d2148292

antiagainst · knwng · commit 6f3cf339273e · 2025-03-04T21:05:18.000-06:00
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 @@
-ffe3129e9bdc146ee4d91e849173d1c64b1ae974
+3963d2148292145543cf83b13ff839a63995fdc2
