Description:
------------
Trying to build a 32-bits version of master (git rev. 1123032) on x64 fails when --enable-tokenizer=shared is used on the configure line.

Using the same configure line without the "=shared" part or without the tokenizer extension altogether, PHP builds correctly.

Test script:
---------------
export CFLAGS="$CFLAGS -m32"
export CXXFLAGS="$CXXFLAGS -m32"
export LDFLAGS="$LDFLAGS -m32"

./configure \
    --disable-all \
    --enable-tokenizer=shared

make


Expected result:
----------------
No errors.

Actual result:
--------------
/bin/bash /home/me/php/libtool --silent --preserve-dup-deps --mode=compile cc -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 -IZend/ -I/home/me/php/Zend/ -DPHP_ATOM_INC -I/home/me/php/include -I/home/me/php/main -I/home/me/php -I/home/me/php/ext/date/lib -I/usr/include/libxml2 -I/usr/include/x86_64-linux-gnu -I/home/me/php/ext/mbstring/oniguruma -I/home/me/php/ext/mbstring/libmbfl -I/home/me/php/ext/mbstring/libmbfl/mbfl -I/home/me/php/ext/sqlite3/libsqlite -I/home/me/php/ext/zip/lib -I/home/me/php/TSRM -I/home/me/php/Zend    -I/usr/include -m32 -fvisibility=hidden   -c /home/me/php/Zend/zend_execute.c -o Zend/zend_execute.lo 
In file included from /home/me/php/Zend/zend.h:338:0,
                 from /home/me/php/Zend/zend_execute.c:27:
/home/me/php/Zend/zend_vm_execute.h: In function ‘ZEND_ADD_SPEC_CONST_CONST_HANDLER’:
/home/me/php/Zend/zend_operators.h:569:2: error: ‘asm’ operand has impossible constraints
  __asm__(
  ^
Makefile:2313: recipe for target 'Zend/zend_execute.lo' failed
make: *** [Zend/zend_execute.lo] Error 1
make failed.