[add 2nd macos-14 CI job, using latest DMD as host compiler, and so an emulated fresh x86_64 DMD build]

Author: kinke

.github/workflows/main.yml

@@ -57,6 +57,9 @@ jobs:
           - job_name: macOS 14 arm64, LDC
             os: macos-14
             host_dmd: ldc
+          - job_name: macOS 14 x64, DMD (latest)
+            os: macos-14
+            host_dmd: dmd
           # Disabled because of failure https://issues.dlang.org/show_bug.cgi?id=24518
           # - job_name: macOS 13 x64, DMD (coverage)
           #   os: macos-13
@@ -79,7 +82,8 @@ jobs:
     name: ${{ matrix.job_name }}
     runs-on: ${{ matrix.os }}
     container: ${{ matrix.container_image }}
-    timeout-minutes: 40
+    # for some reason, the compiler testsuite is extremely slow with x86_64 emulation on macos-14 runners
+    timeout-minutes: ${{ matrix.os == 'macos-14' && 60 || 40 }}
     env:
       # for ci/run.sh:
       OS_NAME: ${{ startsWith(matrix.os, 'ubuntu') && 'linux' || (startsWith(matrix.os, 'macos') && 'osx' || (startsWith(matrix.os, 'windows') && 'windows' || '')) }}
@@ -157,7 +161,7 @@ jobs:
         with:
           arch: ${{ env.MODEL == '64' && 'x64' || 'x86' }}
       - name: 'macOS arm64: Run arm64 smoke test'
-        if: matrix.os == 'macos-14'
+        if: matrix.os == 'macos-14' && matrix.host_dmd == 'ldc'
         run: |
           set -uexo pipefail