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MemoryBuffer: Add a missing error-check to getOpenFileImpl
Summary: In case the function was called with a desired read size *and* the file was not an "mmap()" candidate, the function was falling back to a "pread()", but it was failing to check the result of that system call. This meant that the function would return "success" even though the read operation failed, and it returned a buffer full of uninitialized memory. Reviewers: rnk, dblaikie Subscribers: kristina, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D66224 llvm-svn: 368977
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