Avoid buffered reads of /dev/urandom
I am seeing disappointing clang performance on a large PowerPC64
Linux box. GetRandomNumberSeed() does a buffered read from
/dev/urandom to seed its PRNG. As a result we read an entire page
even though we only need 4 bytes.
With every clang task reading a page worth of /dev/urandom we
end up spending a large amount of time stuck on kernel spinlock.
Patch by Anton Blanchard!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255386
91177308-0d34-0410-b5e6-
96231b3b80d8