Subzero: Add a missing absolute path to llvm-mc command.

pydir/szbuild.py

 #!/usr/bin/env python2
 
 import argparse
 import os
 import pipes
 import re
 import sys
 
 from utils import shellcmd
 from utils import FindBaseNaCl
@@ skipping 221 matching lines @@
                  args.sz_args +
                  [pexe],
                  echo=args.verbose)
         if args.filetype != 'obj':
             triple = {
               'arm32': 'arm-nacl' if args.sandbox else 'arm',
               'x8632': 'i686-nacl' if args.sandbox else 'i686',
             }[args.target]
 
             shellcmd((
-                'llvm-mc -triple={triple} -filetype=obj -o {obj} {asm}'
-                ).format(asm=asm_sz, obj=obj_sz, triple=triple),
+                '{base}/llvm-mc -triple={triple} -filetype=obj -o {obj} {asm}'
+                ).format(base=path_addition, asm=asm_sz, obj=obj_sz,
+                         triple=triple),
                      echo=args.verbose)
         if not args.sandbox:
             shellcmd((
                 '{objcopy} --redefine-sym _start=_user_start {obj}'
                 ).format(objcopy=objcopy, obj=obj_sz), echo=args.verbose)
         if hybrid:
             shellcmd((
                 'nm {obj} | sed -n "s/.* [a-zA-Z] //p" > {sym}'
                 ).format(obj=obj_sz, sym=sym_sz), echo=args.verbose)
 
@@ skipping 111 matching lines @@
 
     # Put the extra verbose printing at the end.
     if args.verbose and hybrid:
         print 'include={regex}'.format(regex=re_include_str)
         print 'exclude={regex}'.format(regex=re_exclude_str)
         print 'default_match={dm}'.format(dm=default_match)
         print 'Number of Subzero syms = {num}'.format(num=len(sz_syms))
 
 if __name__ == '__main__':
     main()