[clang] Add support for Debian 14 Forky and Debian 15 Duke (llvm#138460)

Futureproofs our single Debian-specific special case for roughly the next 6 years.

See: https://lists.debian.org/debian-devel-announce/2025/01/msg00004.html
(cherry picked from commit 58e6883)

Author: tambry

clang/include/clang/Driver/Distro.h

@@ -39,6 +39,8 @@ class Distro {
     DebianBullseye,
     DebianBookworm,
     DebianTrixie,
+    DebianForky,
+    DebianDuke,
     Exherbo,
     RHEL5,
     RHEL6,
@@ -128,7 +130,7 @@ class Distro {
   bool IsOpenSUSE() const { return DistroVal == OpenSUSE; }
 
   bool IsDebian() const {
-    return DistroVal >= DebianLenny && DistroVal <= DebianTrixie;
+    return DistroVal >= DebianLenny && DistroVal <= DebianDuke;
   }
 
   bool IsUbuntu() const {

clang/lib/Driver/Distro.cpp

@@ -160,6 +160,10 @@ static Distro::DistroType DetectDistro(llvm::vfs::FileSystem &VFS) {
         return Distro::DebianBookworm;
       case 13:
         return Distro::DebianTrixie;
+      case 14:
+        return Distro::DebianForky;
+      case 15:
+        return Distro::DebianDuke;
       default:
         return Distro::UnknownDistro;
       }
@@ -173,6 +177,8 @@ static Distro::DistroType DetectDistro(llvm::vfs::FileSystem &VFS) {
         .Case("bullseye/sid", Distro::DebianBullseye)
         .Case("bookworm/sid", Distro::DebianBookworm)
         .Case("trixie/sid", Distro::DebianTrixie)
+        .Case("forky/sid", Distro::DebianForky)
+        .Case("duke/sid", Distro::DebianDuke)
         .Default(Distro::UnknownDistro);
   }