Move the ConstantInt uniquing table into LLVMContextImpl.  This exposed a number of issues in
our current context-passing stuff, which is also fixed here

llvm-svn: 76089
diff --git a/llvm/lib/Transforms/IPO/ExtractGV.cpp b/llvm/lib/Transforms/IPO/ExtractGV.cpp
index b7c5ca3..fa3a055 100644
--- a/llvm/lib/Transforms/IPO/ExtractGV.cpp
+++ b/llvm/lib/Transforms/IPO/ExtractGV.cpp
@@ -44,6 +44,8 @@
         return false;  // Nothing to extract
       }
       
+      Context = &M.getContext();
+      
       if (deleteStuff)
         return deleteGV();
       M.setModuleInlineAsm("");