[dxso] Omit relative constant range check when possible

We can just rely on robustness2 when it's supported.

src/dxso/dxso_compiler.cpp

@@ -1029,7 +1029,7 @@ namespace dxvk {
 
       result.id = m_module.opLoad(typeId, ptrId);
 
-      if (relative) {
+      if (relative && !m_moduleInfo.options.robustness2Supported) {
         uint32_t constCount = m_module.constu32(m_layout->floatCount);
 
         // Expand condition to bvec4 since the result has four components

src/dxso/dxso_options.cpp

@@ -43,6 +43,8 @@ namespace dxvk {
     longMad = options.longMad;
 
     alphaTestWiggleRoom = options.alphaTestWiggleRoom;
+
+    robustness2Supported = devFeatures.extRobustness2.robustBufferAccess2;
   }
 
 }

src/dxso/dxso_options.h

@@ -54,6 +54,9 @@ namespace dxvk {
     /// Workaround for games using alpha test == 1.0, etc due to wonky interpolation or
     /// misc. imprecision on some vendors
     bool alphaTestWiggleRoom;
+
+    /// Whether or not we can rely on robustness2 to handle oob constant access
+    bool robustness2Supported;
   };
 
 }