Fix #1461: set the SPIRV-Tools' optimizer's target environment.

SPIRV/SpvTools.cpp

@@ -130,8 +130,8 @@ void SpirvToolsValidate(const glslang::TIntermediate& intermediate, std::vector<
 
 // Apply the SPIRV-Tools optimizer to generated SPIR-V, for the purpose of
 // legalizing HLSL SPIR-V.
-void SpirvToolsLegalize(const glslang::TIntermediate&, std::vector<unsigned int>& spirv,
-                        spv::SpvBuildLogger*, const SpvOptions* options)
+void SpirvToolsLegalize(const glslang::TIntermediate& intermediate, std::vector<unsigned int>& spirv,
+                        spv::SpvBuildLogger* logger, const SpvOptions* options)
 {
     spv_target_env target_env = SPV_ENV_UNIVERSAL_1_2;
 
@@ -207,7 +207,8 @@ void SpirvToolsLegalize(const glslang::TIntermediate&, std::vector<unsigned int>
     }
 
     spvtools::OptimizerOptions spvOptOptions;
-    spvOptOptions.set_run_validator(false); // The validator may run as a seperate step later on
+    optimizer.SetTargetEnv(MapToSpirvToolsEnv(intermediate.getSpv(), logger));
+    spvOptOptions.set_run_validator(false); // The validator may run as a separate step later on
     optimizer.Run(spirv.data(), spirv.size(), &spirv, spvOptOptions);
 }