Kernel/Threads: Dynamically allocate the TLS region for threads in the BASE region of the linear heap.

Each thread gets a 0x200-byte area from the 0x1000-sized page, when all 8 thread slots in a single page are used up, the kernel allocates a new page to hold another 8 entries.

This is consistent with what the real kernel does.

src/core/hle/kernel/process.h

@@ -140,8 +140,11 @@ public:
 
     MemoryRegionInfo* memory_region = nullptr;
 
-    /// Bitmask of the used TLS slots
-    std::bitset<300> used_tls_slots;
+    /// The Thread Local Storage area is allocated as processes create threads,
+    /// each TLS area is 0x200 bytes, so one page (0x1000) is split up in 8 parts, and each part
+    /// holds the TLS for a specific thread. This vector contains which parts are in use for each page as a bitmask.
+    /// This vector will grow as more pages are allocated for new threads.
+    std::vector<std::bitset<8>> tls_slots;
 
     VAddr GetLinearHeapAreaAddress() const;
     VAddr GetLinearHeapBase() const;