Revert "Merge pull request #74192 from drexin/wip-typed-throws-abi"

This reverts commit 35b2b71, reversing
changes made to c3b57f2.

Author: aschwaighofer

lib/IRGen/CallEmission.h

@@ -19,7 +19,6 @@
 
 #include "Address.h"
 #include "Callee.h"
-#include "Explosion.h"
 #include "Temporary.h"
 
 namespace llvm {
@@ -89,7 +88,6 @@ class CallEmission {
 
   unsigned IndirectTypedErrorArgIdx = 0;
 
-  std::optional<Explosion> typedErrorExplosion;
 
   virtual void setFromCallee();
   void emitToUnmappedMemory(Address addr);
@@ -125,10 +123,6 @@ class CallEmission {
     return CurCallee.getSubstitutions();
   }
 
-  std::optional<Explosion> &getTypedErrorExplosion() {
-    return typedErrorExplosion;
-  }
-
   virtual void begin();
   virtual void end();
   virtual SILType getParameterType(unsigned index) = 0;