Roll third_party/llvm-libc/src/ 4c70d6b5a..60b7db20a (87 commits)

https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libc.git/+log/4c70d6b5a62a..60b7db20ace1

Created with:
  roll-dep third_party/llvm-libc/src

Change-Id: I76736e4b406ee3d44d10cd44989d61f61380598d
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/127517
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Auto-Submit: Andy Phan <andyphan@chromium.org>

DEPS

diff --git a/DEPS b/DEPS
index 1b281e4..c206be8 100644
--- a/DEPS
+++ b/DEPS
@@ -168,7 +168,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling llvm-libc
   # and whatever else without interference from each other.
-  'llvm_libc_revision': '4c70d6b5a62aa6981ba6b2e905b90bd650fb3626',
+  'llvm_libc_revision': '60b7db20ace1cb750f8e9e06e7e9c7c6585ace42',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling markupsafe
   # and whatever else without interference from each other.