SPV: Isolate SPIRV-tools glue to its own file.

SPIRV/GlslangToSpv.h

@@ -38,6 +38,7 @@
     #pragma warning(disable : 4464) // relative include path contains '..'
 #endif
 
+#include "SpvTools.h"
 #include "../glslang/Include/intermediate.h"
 
 #include <string>
@@ -47,14 +48,6 @@
 
 namespace glslang {
 
-struct SpvOptions {
-    SpvOptions() : generateDebugInfo(false), disableOptimizer(true),
-        optimizeSize(false) { }
-    bool generateDebugInfo;
-    bool disableOptimizer;
-    bool optimizeSize;
-};
-
 void GetSpirvVersion(std::string&);
 int GetSpirvGeneratorVersion();
 void GlslangToSpv(const glslang::TIntermediate& intermediate, std::vector<unsigned int>& spirv,