[CallSite removal][TargetLibraryInfo] Replace ImmutableCallSite with CallBase in one of the getLibFunc signatures. NFC

Differential Revision: https://reviews.llvm.org/D78083
diff --git a/llvm/lib/CodeGen/ExpandMemCmp.cpp b/llvm/lib/CodeGen/ExpandMemCmp.cpp
index 7cf3f08..9bc7bb9 100644
--- a/llvm/lib/CodeGen/ExpandMemCmp.cpp
+++ b/llvm/lib/CodeGen/ExpandMemCmp.cpp
@@ -824,7 +824,7 @@
       continue;
     }
     LibFunc Func;
-    if (TLI->getLibFunc(ImmutableCallSite(CI), Func) &&
+    if (TLI->getLibFunc(*CI, Func) &&
         (Func == LibFunc_memcmp || Func == LibFunc_bcmp) &&
         expandMemCmp(CI, TTI, TL, &DL, PSI, BFI)) {
       return true;