Part of upgrade to llvm 20

Author: mcbarton

.github/workflows/emscripten.yml

@@ -21,26 +21,26 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - name: ubu24-arm-gcc12-clang-repl-20-emscripten
+          - name: ubu24-arm-gcc12-clang-repl-19-emscripten
             os: ubuntu-24.04-arm
             compiler: gcc-12
-            clang-runtime: '20'
+            clang-runtime: '19'
             cling: Off
             llvm_enable_projects: "clang;lld"
             llvm_targets_to_build: "WebAssembly"
             emsdk_ver: "3.1.73"
-          - name: osx15-arm-clang-clang-repl-20-emscripten
+          - name: osx15-arm-clang-clang-repl-19-emscripten
             os: macos-15
             compiler: clang
-            clang-runtime: '20'
+            clang-runtime: '19'
             cling: Off
             llvm_enable_projects: "clang;lld"
             llvm_targets_to_build: "WebAssembly"            
             emsdk_ver: "3.1.73"
-          - name: ubu24-x86-gcc12-clang-repl-20-emscripten
+          - name: ubu24-x86-gcc12-clang-repl-19-emscripten
             os: ubuntu-24.04
             compiler: gcc-12
-            clang-runtime: '20'
+            clang-runtime: '19'
             cling: Off
             llvm_enable_projects: "clang;lld"
             llvm_targets_to_build: "WebAssembly"
@@ -459,24 +459,24 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - name: ubu24-x86-gcc12-clang-repl-20-emscripten_wasm
+          - name: ubu24-x86-gcc12-clang-repl-19-emscripten_wasm
             os: ubuntu-24.04
             compiler: gcc-12
-            clang-runtime: '20'
+            clang-runtime: '19'
             cling: Off
             micromamba_shell_init: bash
             emsdk_ver: "3.1.73"
-          - name: osx15-arm-clang-clang-repl-20-emscripten_wasm
+          - name: osx15-arm-clang-clang-repl-19-emscripten_wasm
             os: macos-15
             compiler: clang
-            clang-runtime: '20'
+            clang-runtime: '19'
             cling: Off
             micromamba_shell_init: bash
             emsdk_ver: "3.1.73"
-          - name: ubu24-arm-gcc12-clang-repl-20-emscripten_wasm
+          - name: ubu24-arm-gcc12-clang-repl-19-emscripten_wasm
             os: ubuntu-24.04-arm
             compiler: gcc-12
-            clang-runtime: '20'
+            clang-runtime: '19'
             cling: Off
             micromamba_shell_init: bash
             emsdk_ver: "3.1.73"