[clang][bytecode] Implement Pointer::getType() for function pointers (#154788)

Fixes #152920

Author: tbaederr

clang/lib/AST/ByteCode/Pointer.h

@@ -341,6 +341,8 @@ class Pointer {
   QualType getType() const {
     if (isTypeidPointer())
       return QualType(Typeid.TypeInfoType, 0);
+    if (isFunctionPointer())
+      return asFunctionPointer().getFunction()->getDecl()->getType();
 
     if (inPrimitiveArray() && Offset != asBlockPointer().Base) {
       // Unfortunately, complex and vector types are not array types in clang,

clang/test/AST/ByteCode/functions.cpp

@@ -732,3 +732,8 @@ namespace LocalVarForParmVarDecl {
   }
   static_assert(foo(), "");
 }
+
+namespace PtrPtrCast {
+  void foo() { ; }
+  void bar(int *a) { a = (int *)(void *)(foo); }
+}