Index: lib/Transforms/Utils/LibCallsShrinkWrap.cpp
===================================================================
--- lib/Transforms/Utils/LibCallsShrinkWrap.cpp
+++ lib/Transforms/Utils/LibCallsShrinkWrap.cpp
@@ -529,7 +529,6 @@
 }

 void LibCallsShrinkWrapLegacyPass::getAnalysisUsage(AnalysisUsage &AU) const {
-  AU.setPreservesCFG();
   AU.addRequired<TargetLibraryInfoWrapperPass>();
 }

Index: test/Transforms/InstCombine/shrinkwrap-nopreserve.ll
===================================================================
--- /dev/null
+++ test/Transforms/InstCombine/shrinkwrap-nopreserve.ll
@@ -0,0 +1,8 @@
+; RUN: opt -instcombine -libcalls-shrinkwrap -gvn | FileCheck %s
+
+define void @TEST__MAIN() {
+  %_tmp31 = call float @acosf(float 2.000000e+00)
+  ret void
+}
+
+declare float @acosf(float)