Web: Make switched methods all be non-virtual, more web-dependent code,

added a few more HLSL flag tests.  This was mostly focused on the SPV generator.
Saves about 17K.

gtests/TestFixture.h

@@ -227,7 +227,9 @@ public:
             shader.setAutoMapBindings(true);
         }
         shader.setTextureSamplerTransformMode(texSampTransMode);
+#ifdef ENABLE_HLSL
         shader.setFlattenUniformArrays(flattenUniformArrays);
+#endif
 
         if (controls & EShMsgSpvRules) {
             if (controls & EShMsgVulkanRules) {
@@ -300,7 +302,9 @@ public:
         shader.setShiftSsboBinding(baseSsboBinding);
         shader.setAutoMapBindings(autoMapBindings);
         shader.setAutoMapLocations(true);
+#ifdef ENABLE_HLSL
         shader.setFlattenUniformArrays(flattenUniformArrays);
+#endif
 
         bool success = compile(&shader, code, entryPointName, controls);