Cover extracting -MT dependency from /Fo flag in clang-cl mode

Author: aganea

clang/test/Driver/cl-options.c

@@ -740,9 +740,10 @@
 // NOCLANG-SAME: "-vectorize-slp"
 // NOCLANG-NOT: "--dependent-lib=msvcrt"
 
-// RUN: %clang_cl -O2 -MD /clang:-fno-slp-vectorize /clang:-MD /clang:-MF /clang:my_dependency_file.dep -### -- %s 2>&1 | FileCheck -check-prefix=CLANG %s
+// RUN: %clang_cl -O2 -MD /clang:-fno-slp-vectorize /clang:-MD /clang:-MF /clang:my_dependency_file.dep /c /Fo%/t/cl-options.obj -### -- %s 2>&1 | FileCheck -DPREFIX=%/t -check-prefix=CLANG %s
 // CLANG: "--dependent-lib=msvcrt"
 // CLANG-SAME: "-dependency-file" "my_dependency_file.dep"
+// CLANG-SAME: "-MT" "[[PREFIX]]/cl-options.obj"
 // CLANG-NOT: "--dependent-lib=libcmt"
 // CLANG-NOT: "-vectorize-slp"