[cmake darwin] Use a STATUS message type. Explain where the arches came from.

llvm-svn: 245453
diff --git a/compiler-rt/cmake/Modules/CompilerRTDarwinUtils.cmake b/compiler-rt/cmake/Modules/CompilerRTDarwinUtils.cmake
index 36191f4..8f92f48 100644
--- a/compiler-rt/cmake/Modules/CompilerRTDarwinUtils.cmake
+++ b/compiler-rt/cmake/Modules/CompilerRTDarwinUtils.cmake
@@ -32,7 +32,7 @@
          ARCHES_MATCHED "${LINKER_VERSION}")
   if(ARCHES_MATCHED)
     set(ARCHES "${CMAKE_MATCH_1}")
-    message("Matched ARCHES: ${ARCHES}")
+    message(STATUS "Got ld supported ARCHES: ${ARCHES}")
     string(REPLACE " " ";" ARCHES ${ARCHES})
   else()
     # If auto-detecting fails, fall back to a default set