[roll] Roll llvm-project/libc 9970c36..f9f7816 (2 commits)

f9f7816 Revert "[libc][RISCV] Add naked attribute to setjmp/longjmp" (#100193)
b37f0e0 [libc] Fix missing default value for errno config (#100175)

GitOrigin-RevId: 696d1de58857c0e39194fb8baff5bd61f28ace32
Change-Id: I6b940275b5adb196ca79eb776294524af4660093

Author: global-integration-roller

third_party/flower

@@ -360,7 +360,7 @@
              gitsubmoduleof="fuchsia"
              path="third_party/llvm-libc/src"
              remote="https://llvm.googlesource.com/llvm-project/libc"
-             revision="9970c367c6c00cda4ad0728b43b588709e521d79"/>
+             revision="f9f7816503b7f909283770c6bfc7edb3be2d80ef"/>
     <project name="third_party/lz4"
              gitsubmoduleof="fuchsia"
              path="third_party/lz4"