glslang tear down: Include deleting the keyword map in tear down. From johnk…

OGLCompilersDLL/InitializeDll.cpp

@@ -113,7 +113,7 @@ bool DetachThread()
         return true;
 
     //
-	// Function is re-entrant and this thread may not have been initalised.
+    // Function is re-entrant and this thread may not have been initialized.
     //
     if (OS_GetTLSValue(ThreadInitializeIndex) != 0) {
         if (!OS_SetTLSValue(ThreadInitializeIndex, (void *)0)) {

glslang/MachineIndependent/Scan.cpp

@@ -514,6 +514,14 @@ void TScanContext::fillInKeywordMap()
     ReservedSet->insert("using");
 }
 
+void TScanContext::deleteKeywordMap()
+{
+    delete KeywordMap;
+    KeywordMap = 0;
+    delete ReservedSet;
+    ReservedSet = 0;
+}
+
 int TScanContext::tokenize(TPpContext* pp, TParserToken& token)
 {
     do {

glslang/MachineIndependent/ScanContext.h

@@ -52,6 +52,8 @@ public:
     virtual ~TScanContext() { }
 
     static void fillInKeywordMap();
+    static void deleteKeywordMap();
+
     int tokenize(TPpContext*, TParserToken&);
 
 protected:

glslang/MachineIndependent/ShaderLang.cpp

@@ -668,6 +668,8 @@ int __fastcall ShFinalize()
         PerProcessGPA = 0;
     }
 
+    glslang::TScanContext::deleteKeywordMap();
+
     return 1;
 }