[x86/Linux] add a stub for THROW_CONTROL_FOR_THREAD_FUNCTION (dotnet/…

…coreclr#8455)

THROW_CONTROL_FOR_THREAD_FUNCTION is defined as ThrowControlForThread
for x86/Linux, but unixstubs implements RedirectForThrowControl (which
corresponds to x64/Linux).

This commit renames RedirectForThrowControl as ThrowControlForThread to
fix dangling ThrowControlForThread reference in x86/Linux.

Commit migrated from dotnet/coreclr@528508c

src/coreclr/src/vm/i386/unixstubs.cpp

@@ -6,7 +6,7 @@
 
 extern "C"
 {
-    void RedirectForThrowControl()
+    void ThrowControlForThread()
     {
         PORTABILITY_ASSERT("Implement for PAL");
     }