Add llvm35

It provides (among other things) llvm-symbolizer, which provides line
numbers for ASAN.

Apparently it's not a dependency of clang35.

create_vm.sh

 #!/bin/bash
 
 # x86_64 or x86
-ARCH=x86_64
+ARCH=x86
 
 DISK=vm_$ARCH.img
 DEFAULT_USER=dev
@@ -41,6 +41,7 @@ PACKAGES=(# Core packages
           firefox
           # Development (compilers, interpreters, debuggers, etc.)
           clang35
+          llvm35
           libc++
           gdb
           valgrind