[llvm-commits] Fold duplicate actions for multiple landing pads

[Duncan Sands]

This fixes a FIXME in the dwarf writer: different landing pads
may have the same actions, but a new action entry was being
written for each one.  With this patch only distinct actions
are written.  I was inspired to do this after noticing that
the same action was being output 24 times in an example I
was looking at for other reasons.  For that example, this
patch saves about 80 bytes in the exception table.

Ciao,

Duncan.
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