[PATCH] Have a way to let fast-isel handle normally optimized library functions

[reed kotler]

This original code was added by Bob Wilson.

The following commit from the commit:
d49edb7ab098fa0c82f59efbcf1b4eb2958f8dc3

Fall back to selection DAG isel for calls to builtin functions.

Fast isel doesn't currently have support for translating builtin function
calls to target instructions.  For embedded environments where the library
functions are not available, this is a matter of correctness and not
just optimization.  Most of this patch is just arranging to make the
TargetLibraryInfo available in fast isel.  rdar://problem/12008746

The problem with this approach is that the fast-isel code fro a given target can always for things to fall back to selection dag but this patch forces it to do that in all cases.


http://reviews.llvm.org/D7397

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