[libc++] update GCC cherry-pick to build 4.8.5

Cr-Mirrored-From: https://chromium.googlesource.com/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: b4b4259a49218c3a96a84b3f80eb584a9fcb1ce2
diff --git a/utils/docker/debian9/compilers.yml b/utils/docker/debian9/compilers.yml
index 506ca83..bc4917a 100644
--- a/utils/docker/debian9/compilers.yml
+++ b/utils/docker/debian9/compilers.yml
@@ -15,7 +15,7 @@
       args:
         branch: releases/gcc-4.8.5
         install_prefix: /opt/gcc-4.8.5
-        cherry_pick: ec1cc0263f156f70693a62cf17b254a0029f4852
+        cherry_pick: 3a27b4db566c2cde8e043220f3d2c5401159b10e
     image: ericwf/compiler:gcc-4.8.5
   gcc-4.9.4:
     build:
diff --git a/utils/docker/debian9/scripts/build_gcc_version.sh b/utils/docker/debian9/scripts/build_gcc_version.sh
index a0ea9e6..b759373 100755
--- a/utils/docker/debian9/scripts/build_gcc_version.sh
+++ b/utils/docker/debian9/scripts/build_gcc_version.sh
@@ -79,7 +79,6 @@
 
 pushd "$GCC_SOURCE_DIR"
 if [ "$CHERRY_PICK" != "" ]; then
-  git checkout -b cherry-pick-branch
   git fetch origin master --unshallow # Urg, we have to get the entire history. This will take a while.
   git cherry-pick --no-commit -X theirs "$CHERRY_PICK"
 fi