[release/9.0-staging] Fix calling convention mismatch in GC callouts (#111105)

* Fix calling convention mismatch in GC callouts

Fixes #110607.

The native side expects fastcall.

Filed #110684 on the test hole. We would have caught it during x86 bringup if this had _any_ tests since this is a guaranteed stack corruption and crash.

* Change native side instead

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Co-authored-by: Michal Strehovský <MichalStrehovsky@users.noreply.github.com>
Co-authored-by: Jeff Schwartz <jeffschw@microsoft.com>

Author: 3 people

src/coreclr/nativeaot/Runtime/RestrictedCallouts.h

@@ -97,6 +97,6 @@ class RestrictedCallouts
     static CrstStatic s_sLock;
 
     // Prototypes for the callouts.
-    typedef void (F_CALL_CONV * GcRestrictedCallbackFunction)(uint32_t uiCondemnedGeneration);
+    typedef void (* GcRestrictedCallbackFunction)(uint32_t uiCondemnedGeneration);
     typedef CLR_BOOL (* HandleTableRestrictedCallbackFunction)(Object * pObject);
 };