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I added the poisoning back in r76891 (2009) because of some bugs in Unladen Swallow, and then Evan Cheng added the setRangeWritable() call in r81308. Profiling a Release+Asserts build on Windows shows that this memory protection call is actually very expensive. 4 seconds of a 70 second Clang compilation are spent in VirtualQuery. These days we have more reliable tools like ASan to find these kinds of bugs, so we can go ahead and retire these checks. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235542 91177308-0d34-0410-b5e6-96231b3b80d8
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