Make pnacl-translate opt-level also override sandboxed llc's default cmdline.
Make pnacl-translate opt-level also override sandboxed llc's default cmdline.

RequiresNonStandardLLCCommandline() only checks if fast-translate
is on, or if LLC_FLAGS_EXTRA is non-empty.  It did not check the
extra flags added by opt-level.  Since the opt level adds extra flags,
let's put them in LLC_FLAGS_EXTRA.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=3308
TEST= ./scons bitcode=1 --verbose run_gdb_print_symbol_test run_gdb_stack_trace_test run_gdb_change_variable_test platform=x86-32 -k use_sandboxed_translator=1

Review URL: https://codereview.chromium.org/12391066

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@10939 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client