Add AOCC (AMD Optimizing C/C++ Compiler) install config

Add AOCC versions 3.2.0, 4.0.0, 4.1.0, 4.2.0, 5.0.0 and 5.1.0 to cpp.yaml only.
The single tarball contains clang, clang++ and flang — no need for separate
entries in c.yaml or fortran.yaml (same pattern as clang/GCC).
Tarballs are XZ compressed despite the .tar extension.
Two URL patterns needed: older form for ≤ 4.0, newer form for 4.1+.

Closes compiler-explorer/compiler-explorer#430

🤖 Generated by LLM (Claude, via OpenClaw)

Author: mattgodbolt-molty

bin/yaml/cpp.yaml

@@ -1178,6 +1178,35 @@ compilers:
           - 7.1.0
           - 7.1.1
           - 7.2.0
+    aocc:
+      - type: tarballs
+        check_exe: bin/clang++ --version
+        dir: aocc-{{name}}
+        untar_dir: aocc-compiler-{{name}}
+        compression: xz
+        url: https://download.amd.com/developer/eula/aocc-compiler/aocc-compiler-{{name}}.tar
+        targets:
+          - 3.2.0
+          - 4.0.0
+      - type: tarballs
+        check_exe: bin/clang++ --version
+        dir: aocc-{{name}}
+        untar_dir: aocc-compiler-{{name}}
+        compression: xz
+        url: https://download.amd.com/developer/eula/aocc/aocc-{{major}}-{{minor}}/aocc-compiler-{{name}}.tar
+        targets:
+          - name: 4.1.0
+            major: 4
+            minor: 1
+          - name: 4.2.0
+            major: 4
+            minor: 2
+          - name: 5.0.0
+            major: 5
+            minor: 0
+          - name: 5.1.0
+            major: 5
+            minor: 1
     plugins:
       clad:
         path_name: clang-plugins/clad-{{name}}