add testing for asm_js minification/registerization

tests/runner.py

@@ -8715,8 +8715,9 @@ Options that are modified or new in %s include:
 
         # emcc -s RELOOP=1 src.cpp ==> should pass -s to emscripten.py. --typed-arrays is a convenient alias for -s USE_TYPED_ARRAYS
         for params, test, text in [
-          (['-s', 'ASM_JS=1', '-O2'], lambda generated: 'var i1=0' in generated, 'registerize is run by default in -O2'),
-          (['-s', 'ASM_JS=1', '-O2', '-g'], lambda generated: 'var i1=0' not in generated, 'registerize is cancelled by -g'),
+          (['-s', 'ASM_JS=1', '-O2'], lambda generated: 'var i1=0' in generated and not 'function _main' in generated, 'registerize/minify is run by default in -O2'),
+          (['-s', 'ASM_JS=1', '-O2', '--minify', '0'], lambda generated: 'var i1 = 0' in generated and not 'function _main' in generated, 'minify is cancelled, but not registerize'),
+          (['-s', 'ASM_JS=1', '-O2', '-g'], lambda generated: 'var i1=0' not in generated and 'var i1 = 0' not in generated and 'function _main' in generated, 'registerize/minify is cancelled by -g'),
           (['-s', 'INLINING_LIMIT=0'], lambda generated: 'function _dump' in generated, 'no inlining without opts'),
           (['-O3', '-s', 'INLINING_LIMIT=0', '--closure', '0'], lambda generated: 'function _dump' not in generated, 'lto/inlining'),
           (['-Os', '--llvm-lto', '1'], lambda generated: 'function _dump' in generated, '-Os disables inlining'),