Mark tADDrSPi as having side effects again.
Mark tADDrSPi as having side effects again.

It really doesn't, but when r141929 removed the hasSideEffects flag from
this instruction, it caused miscompilations.  I am guessing that it got
moved across a stack pointer update.

Also clear isRematerializable after checking that this instruction is
in fact never rematerialized in the nightly test suite.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@142030 91177308-0d34-0410-b5e6-96231b3b80d8

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