Remove wasm compile time option and enable wasm behind a runtime flag.

test/mjsunit/mjsunit.status

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 148 matching lines @@
   'compiler/escape-analysis-10': [PASS, NO_VARIANTS],
   # TODO(sigurds): Tests that fail because of incomplete use handling (i.e. select).
   'compiler/escape-analysis-8': [PASS, NO_VARIANTS],
 
   # Assumptions about optimization need investigation in TurboFan.
   'regress-sync-optimized-lists': [PASS, NO_VARIANTS],
 
   # issue 4078:
   'allocation-site-info': [PASS, NO_VARIANTS],
 
-  # Native WASM is not yet enabled by default.
-  'wasm/*': [SKIP],
-
   ##############################################################################
   # Too slow in debug mode with --stress-opt mode.
   'compiler/regress-stacktrace-methods': [PASS, ['mode == debug', SKIP]],
   'compiler/regress-funcaller': [PASS, ['mode == debug', SKIP]],
   'regress/regress-2318': [PASS, ['mode == debug', SKIP]],
   'regress/regress-create-exception': [PASS, ['mode == debug', SKIP]],
 
   ##############################################################################
   # Too slow in debug mode for validation of elements.
   'regress/regress-430201': [PASS, ['mode == debug', SKIP]],
@@ skipping 550 matching lines @@
   'd8-worker-sharedarraybuffer': [SKIP],
 }],  # 'predictable == True'
 
 ##############################################################################
 ['arch == ppc and simulator_run == True or arch == ppc64 and simulator_run == True', {
 
   # take too long with the simulator.
   'regress/regress-1132': [SKIP],
 }],  # 'arch == ppc and simulator_run == True'
 
+
+# TODO(bradnelson): Figure out why this fails for arm.
+['arch == arm', {
+  'wasm/asm-wasm': [SKIP],
+}],
+
+# TODO(bradnelson): Figure out why this crashes under asan.
+['asan == True', {
+  'wasm/asm-wasm': [SKIP],
+}],
+
+# TODO(titzer): Figure out why parameter passing on 32-bit is broken.
+['arch != x64', {
+  'wasm/params': [SKIP],
+}],
+
+# TODO(titzer): Figure out why arm64 is broken for wasm.
+['arch == arm64', {
+  'wasm/*': [SKIP],
+}],
+
+
 ['ignition == True', {
   'asm/*': [SKIP],
   'compiler/*': [SKIP],
   'const*': [SKIP],
   'debug-*': [SKIP],
   'es6/*': [SKIP],
   'es7/*': [SKIP],
   'strong/*': [SKIP],
   'harmony/*': [SKIP],
   'regress/debug*': [SKIP],
   'regress/regress-debug*': [SKIP],
+  'wasm/*': [SKIP],
 
   'allocation-folding': [SKIP],
   'api-call-after-bypassed-exception': [SKIP],
   'apply-arguments-gc-safepoint': [SKIP],
   'arguments-load-across-eval': [SKIP],
   'arguments-read-and-assignment': [SKIP],
   'array-bounds-check-removal': [SKIP],
   'array-constructor': [SKIP],
   'array-elements-from-array-prototype-chain': [SKIP],
   'array-functions-prototype-misc': [SKIP],
@@ skipping 336 matching lines @@
 
 ##############################################################################
 ['gcov_coverage', {
   # Tests taking too long.
   'array-functions-prototype-misc': [SKIP],
   'strong/implicit-conversions': [SKIP],
   'strong/load-element-mutate-backing-store': [SKIP],
 }],  # 'gcov_coverage'
 
 ]