[roll] Roll llvm-project/libc 6738aef..8f6cdca (4 commits)

8f6cdca [libc] expose aux vector (#75806)
d3c8f19 [libc] Improve get_object_files_for_test to reduce CMake configure time for tests. (#75552)
4f8711e Use StringRef::{starts,ends}_with (NFC)
faa59a9 [libc] Fix improper initialization of `StorageType` (#75610)

GitOrigin-RevId: e366ed3e2a9d6fab73f92e5901d3245f154d2be3
Change-Id: I41d13d430d5dfd4763e767074ce826f1364a1bd7
diff --git a/third_party/flower b/third_party/flower
index 0e939f1..6369a0c 100644
--- a/third_party/flower
+++ b/third_party/flower
@@ -319,7 +319,7 @@
              gitsubmoduleof="fuchsia"
              path="third_party/llvm-libc/src"
              remote="https://llvm.googlesource.com/llvm-project/libc"
-             revision="6738aef664f6b7605a47f3868affc4d5994d09d3"/>
+             revision="8f6cdca26fcc4bcb4f743243cb96d31ba513cbef"/>
     <project name="third_party/lz4"
              gitsubmoduleof="fuchsia"
              path="third_party/lz4"