Propagate the MemoryQualifierSetDecoration (shader-slang#6315)

Propagate the kIROp_MemoryQualifierSetDecoration
memory decorations when converting from structures
to flat global resources

struct Tex
{
    globallycoherent float4 bias = { 0.1, 0.3, 0.9, 1.5};
};
uniform Tex gTex;

should have the following code generated in GLSL:

coherent layout(rgba32f)
layout(binding = 2)
uniform image2D globalParams_gTex_tex_0;

This closes shader-slang#6079

Author: zlatinski

source/slang/slang-ir-legalize-types.cpp

@@ -2711,6 +2711,7 @@ static void cloneDecorationToVar(IRInst* srcInst, IRInst* varInst)
         case kIROp_FormatDecoration:
         case kIROp_UserTypeNameDecoration:
         case kIROp_SemanticDecoration:
+        case kIROp_MemoryQualifierSetDecoration:
             cloneDecoration(decoration, varInst);
             break;