Fix SPIRV validation errors.

Author: csyonghe

source/slang/slang-emit-spirv.cpp

@@ -5222,6 +5222,7 @@ struct SPIRVEmitContext : public SourceEmitterBase, public SPIRVEmitSharedContex
             case IRTargetBuiltinVarName::SpvInstanceIndex:
                 return getBuiltinGlobalVar(inst->getFullType(), SpvBuiltInInstanceIndex, inst);
             case IRTargetBuiltinVarName::SpvBaseInstance:
+                requireSPIRVCapability(SpvCapabilityDrawParameters);
                 return getBuiltinGlobalVar(inst->getFullType(), SpvBuiltInBaseInstance, inst);
             }
         }

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

@@ -626,6 +626,8 @@ GLSLSystemValueInfo* getGLSLSystemValueInfo(
         requiredType = builder->getBasicType(BaseType::Int);
         name = "gl_InstanceIndex";
         targetVarName = IRTargetBuiltinVarName::HlslInstanceID;
+        context->requireSPIRVVersion(SemanticVersion(1, 3));
+        context->requireGLSLExtension(toSlice("GL_ARB_shader_draw_parameters"));
     }
     else if (semanticName == "sv_isfrontface")
     {