Rename isWeakForLinker to mayBeOverridden. Use it

instead of hasWeakLinkage in a bunch of optimization
passes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56782 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/IPO/IPConstantPropagation.cpp

@@ -155,7 +155,7 @@ bool IPCP::PropagateConstantReturn(Function &F) {
 
   // If this function could be overridden later in the link stage, we can't
   // propagate information about its results into callers.
-  if (F.hasLinkOnceLinkage() || F.hasWeakLinkage())
+  if (F.hasLinkOnceLinkage() || F.mayBeOverridden())
     return false;
   
   // Check to see if this function returns a constant.