ASM_CONSTS mismatch when building two wasm modules: one with -msimd128 and one without

Hi all,

I'm attempting to build a wasm module with Emscripten once with `-msimd128 -msse2` and have a fallback without. This uses the makeflags

```
ifeq ($(P_SIMD),1)
LINKFLAGS += -msimd128 -msse2 // later passed to emcc
COMPILEFLAGS += -msimd128 -msse2 // later passed to emcc
endif
```

Here are our complete emcc flags sent to the compiler:

```
// SIMD version
emcc -s WASM=1 --bind -s STACK_SIZE=8388608 -s GL_WORKAROUND_SAFARI_GETCONTEXT_BUG=0 -s NO_DYNAMIC_EXECUTION=1 --lembind --closure 0 --no-heap-copy -s USE_SDL=2 -s FETCH=1 -s ALLOW_MEMORY_GROWTH=1 -s MAX_WEBGL_VERSION=2 -Oz -msimd128 -msse2 -s MODULARIZE=1 -s NODEJS_CATCH_REJECTION=0 -s ENVIRONMENT=web -s EXPORTED_FUNCTIONS="['_main', '_setThrew', '_malloc', '_free']" -s EXPORTED_RUNTIME_METHODS="['ccall', 'cwrap','lengthBytesUTF8','stringToUTF8','UTF8ToString','callMain']" @allobjfiles2d.list obj/GL2_SIMD/Release/Core.Cpp/src/module.o -o module.js --post-js postJsOverrides.js
```

```
// Non-SIMD version
emcc -s WASM=1 --bind -s STACK_SIZE=8388608 -s GL_WORKAROUND_SAFARI_GETCONTEXT_BUG=0 -s NO_DYNAMIC_EXECUTION=1 --lembind --closure 0 --no-heap-copy -s USE_SDL=2 -s FETCH=1 -s ALLOW_MEMORY_GROWTH=1 -s MAX_WEBGL_VERSION=2 -Oz -s MODULA
RIZE=1 -s NODEJS_CATCH_REJECTION=0 -s ENVIRONMENT=web -s EXPORTED_FUNCTIONS="['_main', '_setThrew', '_malloc', '_free']" -s EXPORTED_RUNTIME_
METHODS="['ccall', 'cwrap','lengthBytesUTF8','stringToUTF8','UTF8ToString','callMain']" @allobjfiles2d.list obj/GL2_NOSIMD/Release/Core.Cpp/src/module.o -o module-nosimd.js --post-js postJsOverrides.js

```

This outputs two modules: `module.wasm` and `module-nosimd.wasm`

Two JS glue codes are generated: `module.js` and `module-nosimd.js`

One problem, I only want to include one set of glue code as it will bloat the final bundle size. However there are minor differences in ASM_CONSTS between the two versions:

This is causing the runtime initialization to fail when loading one wasm or another with the error

```TypeError: ASM_CONSTS[code] is not a function
at runEmAsmFunction (module.js:9:141722)
at _emscripten_asm_const_int (module.js:9:141756)
at module-nosimd.wasm:0xb24e2 ...
```

> **Question:** Is there a way to unify the ASM_CONSTS generated in the two builds to ensure that I can use one module glue code for the two separate wasms (-nosimd and simd variants)?

Thank you in advance,