[PM/AA] Remove the UnknownSize static member from AliasAnalysis.

This is now living in MemoryLocation, which is what it pertains to. It
is also an enum there rather than a static data member which is left
never defined.

llvm-svn: 239886
diff --git a/llvm/lib/Transforms/IPO/FunctionAttrs.cpp b/llvm/lib/Transforms/IPO/FunctionAttrs.cpp
index f4a2179..bb5e64a 100644
--- a/llvm/lib/Transforms/IPO/FunctionAttrs.cpp
+++ b/llvm/lib/Transforms/IPO/FunctionAttrs.cpp
@@ -208,7 +208,7 @@
                 AAMDNodes AAInfo;
                 I->getAAMetadata(AAInfo);
 
-                MemoryLocation Loc(Arg, AliasAnalysis::UnknownSize, AAInfo);
+                MemoryLocation Loc(Arg, MemoryLocation::UnknownSize, AAInfo);
                 if (!AA->pointsToConstantMemory(Loc, /*OrLocal=*/true)) {
                   if (MRB & AliasAnalysis::Mod)
                     // Writes non-local memory.  Give up.