Patch: StackMap: Use IndirectMemRefOp more.

[Gustaw Smolarczyk]

Hello all.

This is my first patch to the LLVM project. I hope you will find it useful.

This patch improves the experimental stackmap and patchpoint intrinsics.
It tries to use the IndirectMemRefOp in more cases. Currently, they are
only emitted for values spilled to a local stack. However, they could be
applied for any [Register + Offset] memory load.

I had problems with indirect FrameIndex references. Because my code can't
retrieve the offset of such a memory reference, it allocates a register for
every such access, which caused one of the tests to fail. This is why I
disabled it for this case.

I am not very familiar with the LLVM code base. I might have done something
in a roundabout or simply incorrect way. I would be glad if I had been
given some pointers.

Regards,
Gustaw
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