[PATCH] ubsan: Only emit constants for filenames and type descriptors once.

Will Dietz wdietz2 at illinois.edu
Thu Nov 7 15:34:02 PST 2013

Produces neater IR in significantly less time.

(~18% faster -O0 compile time for sqlite3 with -fsanitize=undefined)

Patch attached, both of these were marked as FIXME's previously.

Okay to commit?

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