8067699: Better glyph storage

Reviewed-by: srl, bae, mschoene

src/share/native/sun/font/layout/LigatureSubstProc.cpp

@@ -115,7 +115,7 @@ ByteOffset LigatureSubstitutionProcessor::processStateEntry(LEGlyphStorage &glyp
                   LE_DEBUG_BAD_FONT("off end of ligature substitution header");
                   return newState; // get out! bad font
               }
-              if(componentGlyph > glyphStorage.getGlyphCount()) {
+              if(componentGlyph >= glyphStorage.getGlyphCount()) {
                 LE_DEBUG_BAD_FONT("preposterous componentGlyph");
                 currGlyph++;
                 return newState; // get out! bad font

src/share/native/sun/font/layout/LigatureSubstProc2.cpp

@@ -119,7 +119,7 @@ le_uint16 LigatureSubstitutionProcessor2::processStateEntry(LEGlyphStorage &glyp
 
             offset = action & lafComponentOffsetMask;
             if (offset != 0) {
-                if(componentGlyph > glyphStorage.getGlyphCount()) {
+                if(componentGlyph >= glyphStorage.getGlyphCount()) {
                   LE_DEBUG_BAD_FONT("preposterous componentGlyph");
                   currGlyph+= dir;
                   return nextStateIndex; // get out! bad font