Various things:

- putch syscall now directly calls Console::putChar().
- /proc/summary includes some info about kmalloc stats.
- Syscall entry is guarded by a simple spinlock.
- Unmap regions for crashed tasks.

Kernel/Console.h

@@ -12,9 +12,9 @@ public:
     virtual ssize_t read(byte* buffer, size_t size) override;
     virtual ssize_t write(const byte* data, size_t size) override;
 
-private:
     void putChar(char);
 
+private:
     const byte m_rows { 25 };
     const byte m_columns { 80 };
     byte m_cursorRow { 0 };