Implement registering JIT unwind information on Windows.

This commit implements registering unwind information for JIT functions on
Windows so that the operating system can both walk and unwind stacks containing
JIT frames.

Currently this only works with Cranelift as lightbeam does not emit unwind
information yet.

This commit also resets the stack guard page on Windows for stack overflow
exceptions, allowing reliable stack overflow traps.

With these changes, all previously disabled test suite tests (not including
the multi-value tests) on Windows are now passing.

Fixes #291.

wasmtime-runtime/signalhandlers/SignalHandlers.hpp

@@ -13,7 +13,7 @@ extern "C" {
 
 int8_t CheckIfTrapAtAddress(const uint8_t* pc);
 // Record the Trap code and wasm bytecode offset in TLS somewhere
-void RecordTrap(const uint8_t* pc);
+void RecordTrap(const uint8_t* pc, bool reset_guard_page);
 
 void* EnterScope(void*);
 void LeaveScope(void*);