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

test/cctest/cctest.gyp

Index: test/cctest/cctest.gyp
diff --git a/test/cctest/cctest.gyp b/test/cctest/cctest.gyp
index a9c48a3dfe531b40ad5ff187a1b82391bdf59fb8..16dfc214159e2a682bc867ac5753797cae061312 100644
--- a/test/cctest/cctest.gyp
+++ b/test/cctest/cctest.gyp
@@ -185,6 +185,9 @@
         'test-weakmaps.cc',
         'test-weaksets.cc',
         'trace-extension.cc',
+        'wasm/test-run-wasm.cc',
+        'wasm/test-run-wasm-module.cc',
+        'wasm/test-signatures.h',
       ],
       'conditions': [
         ['v8_target_arch=="ia32"', {
@@ -301,13 +304,6 @@
         }, {
           'dependencies': ['../../tools/gyp/v8.gyp:v8'],
         }],
-        ['v8_wasm!=0', {
-          'sources': [
-            'wasm/test-run-wasm.cc',
-            'wasm/test-run-wasm-module.cc',
-            'wasm/test-signatures.h',
-          ],
-        }],
       ],
     },
     {