Konstantin Zhuravlyov 081385a74e [DAGCombiner] Do not remove the load of stored values when optimizations are disabled
This combiner breaks debug experience and should not be run when optimizations are disabled.

For example:
  int main() {
    int j = 0;
    j += 2;
    if (j == 2)
      return 0;
    return 5;
  }
When debugging this code compiled in /O0, it should be valid to break at line "j+=2;" and edit the value of j. It should change the return value of the function.

Differential Revision: https://reviews.llvm.org/D19268

llvm-svn: 284014
2016-10-12 13:44:24 +00:00
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