Jakob Stoklund Olesen ebaf92c67d Use uniqued StringInit pointers for lookups.
This avoids a gazillion StringMap and dynamic_cast calls, making
TableGen run 3x faster.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148091 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-13 03:16:35 +00:00
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