Fix #1043: set all scan string-locations to have bias, not just the first one.

glslang/Include/Common.h

@@ -222,6 +222,7 @@ inline const TString String(const int i, const int /*base*/ = 10)
 
 struct TSourceLoc {
     void init() { name = nullptr; string = 0; line = 0; column = 0; }
+    void init(int stringNum) { init(); string = stringNum; }
     // Returns the name if it exists. Otherwise, returns the string number.
     std::string getStringNameOrNum(bool quoteStringName = true) const
     {