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/AddReadAttrs.cpp

@@ -63,7 +63,7 @@ bool AddReadAttrs::runOnSCC(const std::vector<CallGraphNode *> &SCC) {
 
     // Definitions with weak linkage may be overridden at linktime with
     // something that writes memory, so treat them like declarations.
-    if (F->isDeclaration() || F->hasWeakLinkage()) {
+    if (F->isDeclaration() || F->mayBeOverridden()) {
       if (!F->onlyReadsMemory())
         // May write memory.
         return false;