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Built from toolchain/binutils 5b0b7aca66a30692402df9a9909ebbad7acac259

Contains Yiran's patch to work around overly aggressive hidden symbol
warning.

Bug: http://b/21502954
Change-Id: If30c8c74200d87931f177b38c2724d336750200c
(cherry picked from commit c0371efb)

Change-Id: I111824c2b8e610a10ef3edcfaba24bd18037f614

Change-Id: Id413578ec85b2b947a52be6da967b92b5d81e142

mainly to contain the fix about bognus array-bound checking
See https://android-review.googlesource.com/#/c/125800

Change-Id: I22c98ebab9dee5b94fe2b13d6a2a2da9e7fa12d3

Build instructions (on MacOSX):

export AOSP=your-AOSP-path
export NDK=$AOSP/ndk
cd $NDK ; ./build/tools/dev-cleanup.sh
./build/tools/download-toolchain-sources.sh /tmp/ndk-$USER/src
./build/tools/gen-platforms.sh --minimal --dst-dir=$NDK --ndk-dir=$NDK --arch=x86_64
./build/tools/build-gcc.sh /tmp/ndk-$USER/src $NDK x86_64-4.9 --try-64
rm -rf $NDK/toolchains/x86_64-4.9/prebuilt/darwin-x86_64/sysroot
cp -a $NDK/toolchains/x86_64-4.9/prebuilt/darwin-x86_64/* \
  $AOSP/prebuilts/gcc/darwin-x86_64/x86/x86_64-linux-android-4.9

Change-Id: Ibe68587189bfab7da6a688b8357481b29a65091f