Made multiple calls to ShInitialize not assert.

src/common/version.h

 #define MAJOR_VERSION 1
 #define MINOR_VERSION 2
 #define BUILD_VERSION 0
-#define BUILD_REVISION 2430
+#define BUILD_REVISION 2431
 
 #define STRINGIFY(x) #x
 #define MACRO_STRINGIFY(x) STRINGIFY(x)

src/compiler/ShaderLang.cpp

@@ -85,12 +85,13 @@ static void getVariableInfo(ShShaderInfo varType,
 }
 
 //
-// Driver must call this first, once, before doing any other
-// compiler operations.
+// Driver must call this first, once, before doing any other compiler operations.
+// Subsequent calls to this function are no-op.
 //
 int ShInitialize()
 {
-    return InitProcess() ? 1 : 0;
+    static const bool kInitialized = InitProcess();
+    return kInitialized ? 1 : 0;
 }
 
 //