Limit HLSL loop scope to match that of GLSL, for excessive loops.

src/compiler/OutputHLSL.cpp

@@ -2052,6 +2052,8 @@ bool OutputHLSL::handleExcessiveLoop(TIntermLoop *node)
                 return false;   // Not an excessive loop
             }
 
+            out << "{";
+
             while (iterations > 0)
             {
                 int clampedLimit = initial + increment * std::min(MAX_LOOP_ITERATIONS, iterations);
@@ -2089,6 +2091,8 @@ bool OutputHLSL::handleExcessiveLoop(TIntermLoop *node)
                 iterations -= MAX_LOOP_ITERATIONS;
             }
             
+            out << "}";
+
             return true;
         }
         else UNIMPLEMENTED();