install-wrappers: Install wrappers named <target>-llvm-ar and <target>-llvm-ranlib

This is necessary for CMake to detect working IPO (LTO); if the
compiler is named <target>-{gcc,clang}, CMake expects to find
matching tools named <target>-llvm-{ar,ranlib} too. (The CMake
module CheckIPOSupported and function check_ipo_supported expects
to have CMAKE_LANG_COMPILER_AR and ..._RANLIB set to working tools;
the Clang-FindBinUtils.cmake module looks for tools named
llvm-ar/llvm-ranlib with the same prefix as the compiler.)

install-wrappers.sh

@@ -88,11 +88,18 @@ for arch in $ARCHS; do
         for exec in clang clang++ gcc g++ c++ as; do
             ln -sf clang-target-wrapper$CTW_SUFFIX $arch-w64-$target_os-$exec$CTW_LINK_SUFFIX
         done
-        for exec in addr2line ar ranlib nm objcopy readelf strings strip; do
+        for exec in addr2line ar ranlib nm objcopy readelf strings strip llvm-ar llvm-ranlib; do
             if [ -n "$HOST" ]; then
                 link_target=llvm-wrapper
             else
-                link_target=llvm-$exec
+                case $exec in
+                llvm-*)
+                    link_target=$exec
+                    ;;
+                *)
+                    link_target=llvm-$exec
+                    ;;
+                esac
             fi
             ln -sf $link_target$EXEEXT $arch-w64-$target_os-$exec$EXEEXT || true
         done