Add __truncxfhf2() to libclcore_g.bc as well on x86 targets.

Bug: http://b/23535482

In order to facilitate x86 debugging (and simplify our build a bit), I
moved this function to a separate file. Once we have updated LLVM, we
can remove this function (since it won't be used anymore).

Change-Id: I91106a177b987187e40d556a2a0ae96e24b09e65
(cherry picked from commit 53f2796ad6c7487c298b49b62a0ea36ac95c54e5)
3 files changed