[PM] Remove the restricted visibility from the instcombine worklist. Now

that library consumers access the instcombine pass directly, they also
(transitively) access the worklist. Also, it would need to be used
directly in order to have a useful utility if we ever want that.

This should fix some warnings since I moved this code. Sorry for the
trouble.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227025 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Transforms/InstCombine/InstCombineWorklist.h

@@ -23,7 +23,7 @@ namespace llvm {
 
 /// InstCombineWorklist - This is the worklist management logic for
 /// InstCombine.
-class LLVM_LIBRARY_VISIBILITY InstCombineWorklist {
+class InstCombineWorklist {
   SmallVector<Instruction*, 256> Worklist;
   DenseMap<Instruction*, unsigned> WorklistMap;