[dragonegg PATCH] Turn off libcall simplification in C and C++ when -fno-builtin is specified

[Peter Collingbourne]

Hi,

This patch turns off libcall simplification in C and C++ when
-fno-builtin is specified.

For now I decided to leave the other languages alone, as this is
probably insufficient for those languages [1].

OK to commit?

Thanks,
-- 
Peter

[1] http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-April/061073.html
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