Add test case for mingw -fuse-ld= support introduced in r242121.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@253066 91177308-0d34-0410-b5e6-96231b3b80d8

test/Driver/mingw-useld.c

+// RUN: %clang -### -target i686-pc-windows-gnu --sysroot=%S/Inputs/mingw_clang_tree/mingw32 %s 2>&1 | FileCheck -check-prefix=CHECK_LD_32 %s
+// CHECK_LD_32: {{ld|ld.exe}}"
+// CHECK_LD_32: "i386pe"
+// CHECK_LD_32_NOT: "-flavor" "gnu"
+
+// RUN: %clang -### -target i686-pc-windows-gnu --sysroot=%S/Inputs/mingw_clang_tree/mingw32 %s -fuse-ld=lld 2>&1 | FileCheck -check-prefix=CHECK_LLD_32 %s
+// CHECK_LLD_32: "lld" "-flavor" "gnu"
+// CHECK_LLD_32: "i386pe"
+
+// RUN: %clang -### -target i686-pc-windows-gnu --sysroot=%S/Inputs/mingw_clang_tree/mingw32 %s -fuse-ld=link.exe 2>&1 | FileCheck -check-prefix=CHECK_LINK_32 %s
+// CHECK_LINK_32: link.exe"
+// CHECK_LINK_32: "i386pe"
+
+// RUN: %clang -### -target x86_64-pc-windows-gnu --sysroot=%S/Inputs/mingw_clang_tree/mingw32 %s -fuse-ld=lld 2>&1 | FileCheck -check-prefix=CHECK_LLD_64 %s
+// CHECK_LLD_64: "lld" "-flavor" "gnu"
+// CHECK_LLD_64: "i386pep"
+
+// RUN: %clang -### -target arm-pc-windows-gnu --sysroot=%S/Inputs/mingw_clang_tree/mingw32 %s -fuse-ld=lld 2>&1 | FileCheck -check-prefix=CHECK_LLD_ARM %s
+// CHECK_LLD_ARM: "lld" "-flavor" "gnu"
+// CHECK_LLD_ARM: "thumb2pe"