[analyzer] Handle the M_ZERO and __GFP_ZERO flags in kernel mallocs.
Add M_ZERO awareness to malloc() static analysis in Clang for FreeBSD, NetBSD, and OpenBSD in a similar fashion to O_CREAT for open(2). These systems have a three-argument malloc() in the kernel where the third argument contains flags; the M_ZERO flag will zero-initialize the allocated buffer. This should reduce the number of false positives when running static analysis on BSD kernels. Additionally, add kmalloc() (Linux kernel malloc()) and treat __GFP_ZERO like M_ZERO on Linux. Future work involves a better method of checking for named flags without hardcoding values. Patch by Conrad Meyer, with minor modifications by me. llvm-svn: 204832
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