Merge pull request #62367 from compnerd/clang-cl

build: honour `SWIFT_CLANG_LOCATION`

Author: compnerd

cmake/modules/Libdispatch.cmake

@@ -14,6 +14,9 @@ if(NOT CMAKE_SYSTEM_NAME STREQUAL Darwin)
           $<TARGET_FILE_DIR:clang>/clang-cl${CMAKE_EXECUTABLE_SUFFIX})
         set(SWIFT_LIBDISPATCH_CXX_COMPILER
           $<TARGET_FILE_DIR:clang>/clang-cl${CMAKE_EXECUTABLE_SUFFIX})
+      elseif(DEFINED SWIFT_CLANG_LOCATION)
+        set(SWIFT_LIBDISPATCH_C_COMPILER ${SWIFT_CLANG_LOCATION}/clang-cl${CMAKE_EXECUTABLE_SUFFIX})
+        set(SWIFT_LIBDISPATCH_CXX_COMPILER ${SWIFT_CLANG_LOCATION}/clang-cl${CMAKE_EXECUTABLE_SUFFIX})
       else()
         set(SWIFT_LIBDISPATCH_C_COMPILER clang-cl${CMAKE_EXECUTABLE_SUFFIX})
         set(SWIFT_LIBDISPATCH_CXX_COMPILER clang-cl${CMAKE_EXECUTABLE_SUFFIX})