Update llvm/clang/lld to the latest version

This version allows clang to use address sanitizer for mingw,
adds support for linking against import libraries from GNU tools
and makes the linker provide the __CTOR_LIST__ symbol for better
compatibility with binutils based sysroots, and adds support for
thunks for armv7 (allowing linking armv7 binaries over 16 MB).

build-llvm.sh

@@ -48,13 +48,13 @@ fi
 if [ -n "$SYNC" ] || [ -n "$CHECKOUT" ]; then
     cd llvm
     [ -z "$SYNC" ] || git fetch
-    git checkout 3e090e5aa550f55ab68927d18022c4e244733ab8
+    git checkout 5877e4ed63ba21fb57f2c7fb4ed4950288e2a28c
     cd tools/clang
     [ -z "$SYNC" ] || git fetch
-    git checkout 1bc73590ad1335313e8f262393547b8af67c9167
+    git checkout a866fe7bf7c577b698229106f0ddc2d31b285de8
     cd ../lld
     [ -z "$SYNC" ] || git fetch
-    git checkout 4ea826e45cf92d005bf9b1655920897ffc82f366
+    git checkout df3e3050ef26292a8c7d2d16b073588eba28db6c
     cd ../../..
 fi