Revert "Use intermOut.cpp's IsNan and IsInfinity for parse-time constant folding"

glslang/Include/Common.h

@@ -39,7 +39,6 @@
 
 #include <algorithm>
 #include <cassert>
-#include <cmath>
 #include <cstdio>
 #include <cstdlib>
 #include <list>
@@ -303,34 +302,6 @@ template <class T> int IntLog2(T n)
     return result;
 }
 
-inline bool IsInfinity(double x) {
-#ifdef _MSC_VER
-    switch (_fpclass(x)) {
-    case _FPCLASS_NINF:
-    case _FPCLASS_PINF:
-        return true;
-    default:
-        return false;
-    }
-#else
-    return std::isinf(x);
-#endif
-}
-
-inline bool IsNan(double x) {
-#ifdef _MSC_VER
-    switch (_fpclass(x)) {
-    case _FPCLASS_SNAN:
-    case _FPCLASS_QNAN:
-        return true;
-    default:
-        return false;
-    }
-#else
-  return std::isnan(x);
-#endif
-}
-
 } // end namespace glslang
 
 #endif // _COMMON_INCLUDED_