[PATCH] D15537: limit the number of instructions per block examined by dead store elimination

[Daniel Berlin via llvm-commits]

FWIW: while i am 100% in agreement with philip that we should strive to
avoid these kinds of limits except as an absolute last resort,
...
staring at deadstoreelimination, i can't see how do to what it is doing in
less than N^2 or worse time as long as it uses MDA.

(once it doesn't use MDA, we can make it linear pretty trivially).
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