Rename isWeakForLinker to mayBeOverridden.  Use it
instead of hasWeakLinkage in a bunch of optimization
passes.

llvm-svn: 56782
diff --git a/llvm/lib/Transforms/IPO/AddReadAttrs.cpp b/llvm/lib/Transforms/IPO/AddReadAttrs.cpp
index 897548b..3e7d860 100644
--- a/llvm/lib/Transforms/IPO/AddReadAttrs.cpp
+++ b/llvm/lib/Transforms/IPO/AddReadAttrs.cpp
@@ -63,7 +63,7 @@
 
     // 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;