Fixed LLGLState::checkStates() failing upon context re-creation:

-After new context creation, immediately call LLRender::refreshState() after LLViewerWindow::initGLDefaults() in order to force states to apply.
--LLRender::initGLDefaults optimizes out gl calls by caching states, but the cached values are only applicable to the old context, not the new, so this optimization must be skipped (LLRender::mDirty).
-LLViewerWindow::mStatesDirty also triggered a redundant shader reload, since restoreGL also called setShaders().
Fixed somewhat annoying flicker of a single frame whilst recovering from screen resizing.
-Skip frame if LLViewerWindow::checkSettings() called LLViewerWindow::reshape. (reshape will set gWindowResized to true)
--True optimal fix will require some refactoring.
Reworked how window position is saved in LLViewerWindow::changeDisplaySettings. Hopefully reduces chances of odd behavior (had WindowX and WindowY get stuck at massive negative values before)

indra/newview/llviewerwindow.h

@@ -449,7 +449,7 @@ protected:
 	class LLDebugText* mDebugText; // Internal class for debug text
 	
 	bool			mResDirty;
-	bool			mStatesDirty;
+	//bool			mStatesDirty;  //Singu Note: No longer needed. State update is now in restoreGL.
 	bool			mIsFullscreenChecked; // Did the user check the fullscreen checkbox in the display settings
 	U32			mCurrResolutionIndex;