[binutils] Prevent ld from rewriting tls access sequences with calls

NaCl assembler inserts nops in front of a call for proper bundling. When linker tries to rewrite a code sequence that consists of something followed by a call, it complains about these nops.

At the moment, simply disable rewriting these sequences.

BUG=http://code.google.com/p/nativeclient/issues/detail?id=237
TEST=

Review URL: http://codereview.chromium.org/3467009