Full thread safety working:

- don't use [] for map lookups, it can modify the map
 - copy up built-in symbols out of shared symbol table levels before modifying them
 - enforce shallow vs. deep TType copies
 - combine maxArraySize with the array dimensions vector, encapsulate
 - remove chaining of array types


git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@22953 e7fa87d3-cd2b-0410-9028-fcbf551c1848

glslang/MachineIndependent/Scan.cpp

@@ -550,11 +550,12 @@ int TScanContext::tokenizeIdentifier()
     if (ReservedSet->find(tokenText) != ReservedSet->end())
         return reservedWord();
 
-    keyword = (*KeywordMap)[tokenText];
-    if (keyword == 0) {
+    std::map<std::string, int>::const_iterator it = KeywordMap->find(tokenText);
+    if (it == KeywordMap->end()) {
         // Should have an identifier of some sort
         return identifierOrType();
     }
+    keyword = it->second;
     field = false;
 
     switch (keyword) {