/// getOrCreateSubrange - Create a descriptor for a value range. This
/// implicitly uniques the values returned.
/// getOrCreateSubrange - Create a descriptor for a value range. This
/// implicitly uniques the values returned.
/// createGlobalVariable - Create a new descriptor for the specified global.
/// @param Name Name of the variable.
/// createGlobalVariable - Create a new descriptor for the specified global.
/// @param Name Name of the variable.