[AddressSanitizer] Ensure only AllocaInst is passed to dbg.declare

Various parts of the LLVM code generator assume that the address
argument of a dbg.declare is not a `ptrtoint`-of-alloca. ASan breaks
this assumption, and this results in local variables sometimes being
unavailable at -O0.

GlobalISel, SelectionDAG, and FastISel all do not appear to expect
dbg.declares to have a `ptrtoint` as an operand. This means that they do
not place entry block allocas in the usual side table reserved for local
variables available in the whole function scope. This isn't always a
problem, as LLVM can try to lower the dbg.declare to a DBG_VALUE, but
those DBG_VALUEs can get dropped for all the usual reasons DBG_VALUEs
get dropped. In the ObjC test case I'm looking at, the cause happens to
be that `replaceDbgDeclare` has hoisted dbg.declares into the entry
block, causing LiveDebugValues to "kill" the DBG_VALUEs because the
lexical dominance check fails.

To address this, I propose:

1) Have ASan (always) pass an alloca to dbg.declares (this patch). This
   is a narrow bugfix for -O0 debugging.

2) Make replaceDbgDeclare not move dbg.declares around. This should be a
   generic improvement for optimized debug info, as it would prevent the
   lexical dominance check in LiveDebugValues from killing as many
   variables.

   This means reverting llvm/r227544, which fixed an assertion failure
   (llvm.org/PR22386) but no longer seems to be necessary. I was able to
   complete a stage2 build with the revert in place.

rdar://54688991

Differential Revision: https://reviews.llvm.org/D74369

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