GLSL: Allow desktop shaders to call functions from outside main().

Test/baseResults/110scope.vert.out

 110scope.vert
 ERROR: 0:5: 'a' : redefinition 
-ERROR: 0:34: 'f' : can't call user function from global scope 
 ERROR: 0:57: 'z' : undeclared identifier 
 ERROR: 0:57: 'z' : redefinition 
-ERROR: 4 compilation errors.  No code generated.
+ERROR: 3 compilation errors.  No code generated.
 
 
 Shader version: 110

glslang/Include/revision.h

@@ -2,5 +2,5 @@
 // For the version, it uses the latest git tag followed by the number of commits.
 // For the date, it uses the current date (when then script is run).
 
-#define GLSLANG_REVISION "Overload400-PrecQual.1674"
-#define GLSLANG_DATE "03-Dec-2016"
+#define GLSLANG_REVISION "Overload400-PrecQual.1676"
+#define GLSLANG_DATE "05-Dec-2016"

glslang/MachineIndependent/ParseHelper.cpp

@@ -1109,9 +1109,10 @@ TIntermTyped* TParseContext::handleFunctionCall(const TSourceLoc& loc, TFunction
                 // if builtIn == true, it's definitely a built-in function with EOpNull
                 if (! builtIn) {
                     call->setUserDefined();
-                    if (symbolTable.atGlobalLevel())
-                        error(loc, "can't call user function from global scope", fnCandidate->getName().c_str(), "");
-                    else
+                    if (symbolTable.atGlobalLevel()) {
+                        requireProfile(loc, ~EEsProfile, "calling user function from global scope");
+                        intermediate.addToCallGraph(infoSink, "main(", fnCandidate->getMangledName());
+                    } else
                         intermediate.addToCallGraph(infoSink, currentCaller, fnCandidate->getMangledName());
                 }