[PATCH] [clang/asan] Do not emit memcpy for trivial operator= when -fsanitize-address-field-padding >= 1

[Kostya Serebryany]

Hi majnemer, rsmith,

If we've added poisoned paddings to a type do not emit memcpy for operator=.

http://reviews.llvm.org/D6160

Files:
  lib/CodeGen/CGExprCXX.cpp
  test/CodeGen/sanitize-address-field-padding.cpp
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