Add an option to set the base uniform location

This will be used to generate uniform locations with --aml

glslang/Public/ShaderLang.h

@@ -414,6 +414,7 @@ public:
     void setAutoMapBindings(bool map);
     void setAutoMapLocations(bool map);
     void addUniformLocationOverride(const char* name, int loc);
+    void setUniformLocationBase(int base);
     void setInvertY(bool invert);
     void setHlslIoMapping(bool hlslIoMap);
     void setFlattenUniformArrays(bool flatten);