Sean Callanan 8f1f9a1be3 Now persistent expression data no longer lives with the Target, but rather with ...

the corresponding TypeSystem.  This makes sense because what kind of data there
is -- and how it can be looked up -- depends on the language.

Functionality that is common to all type systems is factored out into
PersistentExpressionState.

llvm-svn: 248934

2015-09-30 19:57:57 +00:00

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