Fix usage of SPIR-V Optimizer

Author: deprilula28

src/nbl/asset/utils/CHLSLCompiler.cpp

@@ -341,12 +341,12 @@ core::smart_refctd_ptr<ICPUShader> CHLSLCompiler::compileToSPIRV(const char* cod
     }
 
     auto outSpirv = core::make_smart_refctd_ptr<ICPUBuffer>(compileResult.objectBlob->GetBufferSize());
+    memcpy(outSpirv->getPointer(), compileResult.objectBlob->GetBufferPointer(), compileResult.objectBlob->GetBufferSize());
 
     // Optimizer step
     if (hlslOptions.spirvOptimizer)
         outSpirv = hlslOptions.spirvOptimizer->optimize(outSpirv.get(), hlslOptions.preprocessorOptions.logger);
 
-    memcpy(outSpirv->getPointer(), compileResult.objectBlob->GetBufferPointer(), compileResult.objectBlob->GetBufferSize());
 
     return core::make_smart_refctd_ptr<asset::ICPUShader>(std::move(outSpirv), stage, IShader::E_CONTENT_TYPE::ECT_SPIRV, hlslOptions.preprocessorOptions.sourceIdentifier.data());
 }