[Clang] Fix type in ItaniumCXXABI for SPIRV

Before, a ptr to function (addrspace(0)) was used. Now we use a pointer to the default address space, the generic addrspace(4). This used to work since before the unqual addrspace used to match the default address space.

Author: jmmartinez

clang/lib/CodeGen/ItaniumCXXABI.cpp

@@ -5039,7 +5039,7 @@ static void InitCatchParam(CodeGenFunction &CGF,
  auto catchRD = CatchType->getAsCXXRecordDecl();
  CharUnits caughtExnAlignment = CGF.CGM.getClassPointerAlignment(catchRD);
 
- llvm::Type *PtrTy = CGF.UnqualPtrTy; // addrspace 0 ok
+ llvm::Type *PtrTy = CGF.Int8PtrTy;
 
  // Check for a copy expression. If we don't have a copy expression,
  // that means a trivial copy is okay.