[multiversion] Remove the function parameter from the unrolling
preferences interface on TTI now that all of TTI is per-function.

llvm-svn: 227741
diff --git a/llvm/lib/Analysis/TargetTransformInfo.cpp b/llvm/lib/Analysis/TargetTransformInfo.cpp
index d51cfb3..5a50d36 100644
--- a/llvm/lib/Analysis/TargetTransformInfo.cpp
+++ b/llvm/lib/Analysis/TargetTransformInfo.cpp
@@ -81,8 +81,8 @@
 }
 
 void TargetTransformInfo::getUnrollingPreferences(
-    const Function *F, Loop *L, UnrollingPreferences &UP) const {
-  return TTIImpl->getUnrollingPreferences(F, L, UP);
+    Loop *L, UnrollingPreferences &UP) const {
+  return TTIImpl->getUnrollingPreferences(L, UP);
 }
 
 bool TargetTransformInfo::isLegalAddImmediate(int64_t Imm) const {