[LLVMdev] Prevent a intrinsic to be reordered?

[Julio]

Hello, I have an intrinsic that matches to a asm instruction directly. This
intrinsic starts a coprocessor that can do anything.

If I put another instruction next to it (a multiplication for example), the
"llc" reorders and puts the intrinsic after the multiplication.

I have tried all:
 - Setting the instruction like if it takes 256 cycles or 0 cycles.
 - Setting the instruction with "hasSideEffects" (which is ignored I think)
 - Setting the instruction as a load, branch, call, etc....
 - ....

These later things are ignored, I don't know if when the intrinsic is
lowered, then it doesn't matter (or perhaps the reorder is made before).

Any clues?

Thanks.
Julio
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