OpenGL Shader expression types traverser

[CedricGuillemet]

better fix to replace this workaround : BabylonJS/Babylon.js#16910
Opengl error : error C7011: implicit cast from "int" to "float"

When converting a uniform int value to a vec4 for bgfx, also replace its use with a cast to int.

So

for (int i = 0; i < 3; i++)
{
     if (i >= morphTargetCount.x)

becomes

for (int i = 0; i < 3; i++)
{
     if (i >= int(morphTargetCount.x))

Current state conversion is if (i >= floatBitsToInt(morphTargetCount.x)) but didn't find a way for a simple int constructor instead.