[BACKEND] Update llvm to llvm/llvm-project@fa57c7a6a5f594a9e3ae2dbe35… (#5064)

Bumping llvm to include a loop unroller fix:
llvm/llvm-project#114573. This is needed for
subsequent loop unroller upstreaming work.

Author: htyu

cmake/llvm-hash.txt

@@ -1 +1 @@
-b74e588e1f460eb48ceb1a30cf8ac870b7537dcc
+fa57c7a6a5f594a9e3ae2dbe3542cf89a20cdd73

test/lib/Instrumentation/GPUHello.cpp

@@ -61,7 +61,7 @@ bool GpuHello::runOnModule(Module &module) {
 
 PassPluginLibraryInfo getPassPluginInfo() {
   const auto callback = [](PassBuilder &pb) {
-    pb.registerOptimizerLastEPCallback([&](ModulePassManager &mpm, auto) {
+    pb.registerOptimizerLastEPCallback([&](ModulePassManager &mpm, auto, auto) {
       mpm.addPass(GpuHello());
       return true;
     });