demangle/gcc2: Skip count > length should skip to the end.

This is the behavior the code expects.

src/add-ons/kernel/debugger/demangle/gcc2.cpp

@@ -49,6 +49,8 @@ public:
 	{
 		if (count > fLength) {
 			TRACE("Input::Skip(): fOffset > fLength\n");
+			fString += fLength;
+			fLength = 0;
 			return;
 		}
 

src/tests/add-ons/kernel/debugger/DemangleTest.cpp

@@ -37,7 +37,7 @@ DemangleTest::RunGCC2Tests()
 		"registerInstance__Q26icu_5713BreakIteratorPQ26icu_5713BreakIteratorRCQ26icu_576Locale18UBreakIteratorTypeR10UErrorCode");
 
 	// Previously caused crashes
-	TEST("SetTo__Q282_GLOBAL_", "SetTo__Q282_GLOBAL_");
+	TEST("SetTo__Q282_GLOBAL_", "_GLOBAL_::SetTo()");
 }