[roll] Roll llvm-project/libc [libc] Fix incorrect unsigned comparison (#135595)
There is a problem with such unsigned comparison pattern:
```
if(unsigned_a - unsigned_b > 0) { /* only NOT go here when unsigned_a==unsigned_b */ }
```
When `unsigned_a` < `unsigned_b`, the result will still be `>0` due to
underflow.
This patch fixes two of the occurrences I found.
Also remove two redundant `if` where its condition is guaranteed by
outer `if`.
GitOrigin-RevId: 5b1083aab38652b13f37b26e8030ccdf82137e31
Original-Revision: 4fb298a8056bc6816505d7742536d16f7d120e1c
Change-Id: I57546585a4b743d19774f87217fe4263f3a96f28
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