aarch64: Bump LLVM version

aarch64-linux-deb9/Dockerfile

@@ -15,33 +15,28 @@ RUN apt-get update \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
 
+COPY fetch-llvm.sh /tmp/fetch-llvm.sh
+
 # Boot LLVM
 ENV PATH /usr/local/bin:$PATH
-ENV LLVM_TARBALL http://releases.llvm.org/6.0.0/clang+llvm-6.0.0-aarch64-linux-gnu.tar.xz
-RUN curl $LLVM_TARBALL | tar -xJC .. && \
-    mkdir /opt/llvm6 && \
-    cp -R clang+llvm*/* /opt/llvm6 && \
-    rm -R clang+llvm* && \
-    /opt/llvm6/bin/llc --version
+ENV BOOT_LLVM_VER 7.1.0
+RUN bash /tmp/fetch-llvm.sh $BOOT_LLVM_VER
 
 # GHC
 RUN curl http://downloads.haskell.org/~ghc/8.6.2/ghc-8.6.2-aarch64-ubuntu_bionic-linux.tar.xz | tar -xJ
 WORKDIR /ghc-8.6.2
-RUN ./configure --prefix=/usr/local LLC=/opt/llvm6/bin/llc OPT=/opt/llvm6/bin/opt && \
+RUN ./configure --prefix=/usr/local \
+                LLC=/opt/llvm-$BOOT_LLVM_VER/bin/llc \
+                OPT=/opt/llvm-$BOOT_LLVM_VER/bin/opt && \
     make install
 WORKDIR /
 RUN rm -Rf ghc-*
 RUN ghc --version
 
 # LLVM
-ENV LLVM_TARBALL http://releases.llvm.org/7.0.0/clang+llvm-7.0.0-aarch64-linux-gnu.tar.xz
-ENV LLC /opt/llvm7/bin/llc
-ENV OPT /opt/llvm7/bin/opt
-RUN curl $LLVM_TARBALL | tar -xJC .. && \
-    mkdir /opt/llvm7 && \
-    cp -R clang+llvm*/* /opt/llvm7 && \
-    rm -R clang+llvm* && \
-    $LLC --version
+RUN bash /tmp/fetch-llvm.sh 8.0.0
+ENV LLC=/opt/llvm-8.0.0/bin/llc
+ENV OPT=/opt/llvm-8.0.0/bin/opt
 
 # Cabal
 RUN git clone https://github.com/haskell/Cabal