[trans-mem] PR47606: Add a tm-safe marker for GIMPLE_ASM's

[Aldy Hernandez]

> Which then immediately fails for one layer of indirection:

Well, this we can fix with a small change to the inliner, by propagating 
the ASM_TM_SAFE bit through the inlined copies.  See patch below.

I'm worried the tm_waiver approach will require changes to TM sources. 
But I'll gladly let you play around with it.

Thanks.
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