[compiler-rt] PATCH: Properly read /proc/self/smaps in nohugepage_test.cc

[H.J. Lu]

This patch fixes 2 problems in FileToString:

1. /proc/self/smaps may be bigger than 1 << 14.  On my machine, it is
26KB.
2. The read system call may return a partially filled buffer.  We need
to check the return value from read.


-- 
H.J.
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