Merge pull request #76630 from drexin/wip-135954459

[IRGen] Reintroduce typed throws ABI

Author: drexin

lib/IRGen/CallEmission.h

@@ -19,6 +19,7 @@
 
 #include "Address.h"
 #include "Callee.h"
+#include "Explosion.h"
 #include "Temporary.h"
 
 namespace llvm {
@@ -90,6 +91,7 @@ class CallEmission {
 
   unsigned IndirectTypedErrorArgIdx = 0;
 
+  std::optional<Explosion> typedErrorExplosion;
 
   virtual void setFromCallee();
   void emitToUnmappedMemory(Address addr);
@@ -110,6 +112,11 @@ class CallEmission {
                                    TemporarySet &temporaries,
                                    bool isOutlined);
 
+  bool mayReturnTypedErrorDirectly() const;
+  void emitToUnmappedExplosionWithDirectTypedError(SILType resultType,
+                                                   llvm::Value *result,
+                                                   Explosion &out);
+
   CallEmission(IRGenFunction &IGF, llvm::Value *selfValue, Callee &&callee)
       : IGF(IGF), selfValue(selfValue), CurCallee(std::move(callee)) {}
 
@@ -129,6 +136,10 @@ class CallEmission {
     UseProfilingThunk = true;
   }
 
+  std::optional<Explosion> &getTypedErrorExplosion() {
+    return typedErrorExplosion;
+  }
+
   virtual void begin();
   virtual void end();
   virtual SILType getParameterType(unsigned index) = 0;