Merge pull request #8191 from eska014/webgl2-export

WebGL 2 export per WebAssembly or asm.js

platform/javascript/detect.py

@@ -73,7 +73,7 @@ def configure(env):
         env.Append(LINKFLAGS=['-O3'])
     elif (env["target"] == "release_debug"):
         env.Append(CCFLAGS=['-O2', '-DDEBUG_ENABLED'])
-        env.Append(LINKFLAGS=['-O2'])
+        env.Append(LINKFLAGS=['-O2', '-s', 'ASSERTIONS=1'])
         # retain function names at the cost of file size, for backtraces and profiling
         env.Append(LINKFLAGS=['--profiling-funcs'])
     elif (env["target"] == "debug"):