Add llvm-toolset-15.0

build-gating.fmf

@@ -27,6 +27,10 @@ adjust:
     environment+:
       WITH_SCL: "scl enable llvm-toolset-14.0"
     when: "collection == llvm-toolset-14.0"
+  - because: "When testing SCL-ized LLVM, the collection must be enabled first"
+    environment+:
+      WITH_SCL: "scl enable llvm-toolset-15.0"
+    when: "collection == llvm-toolset-15.0"
 
 discover:
     - name: lldb-tests

lldb-dwz/main.fmf

@@ -25,3 +25,6 @@ adjust:
   - require+:
       - llvm-toolset-14.0-lldb
     when: collection == llvm-toolset-14.0
+  - require+:
+      - llvm-toolset-15.0-lldb
+    when: collection == llvm-toolset-15.0

python-embedded-interpreter/main.fmf

@@ -31,3 +31,8 @@ adjust:
     environment+:
       LLDB_PACKAGE: llvm-toolset-14.0-lldb
     when: collection == llvm-toolset-14.0
+  - require+:
+      - llvm-toolset-15.0-lldb
+    environment+:
+      LLDB_PACKAGE: llvm-toolset-15.0-lldb
+    when: collection == llvm-toolset-15.0