Tweak TLS init/deinit (#4551)

* Delete the entire TLS in one go
* Put TLS allocation separately
* Keep TLS in a single array

kotlin-native/runtime/src/main/cpp/CompilerExport.cpp

@@ -35,7 +35,6 @@ void EnsureDeclarationsEmitted() {
     ensureUsed(EnterFrame);
     ensureUsed(LeaveFrame);
     ensureUsed(AddTLSRecord);
-    ensureUsed(ClearTLSRecord);
     ensureUsed(LookupTLS);
     ensureUsed(MutationCheck);
     ensureUsed(CheckLifetimesConstraint);