[LLVMbugs] [Bug 715] NEW: Fix / clean up memory allocation related optimizations

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=715

           Summary: Fix / clean up memory allocation related optimizations
           Product: libraries
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Interprocedural Optimizations
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: evan.cheng at apple.com


JM/ldecod was suffering on Darwin because calloc was inlined to malloc + memset. Turns out Darwin's 
calloc was much smarter.

1. Teach the optimizer that calloc / realloc return new pointers, just like "malloc".
2. Eliminate MallocInst. Just recognize malloc, calloc, calls.
3. Fold malloc / memset to calloc calls when it's profitable (e.g. on Darwin).



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