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/IPConstantPropagation.cpp b/llvm/lib/Transforms/IPO/IPConstantPropagation.cpp
index aecec44..66fc2e3 100644
--- a/llvm/lib/Transforms/IPO/IPConstantPropagation.cpp
+++ b/llvm/lib/Transforms/IPO/IPConstantPropagation.cpp
@@ -155,7 +155,7 @@
 
   // 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.