Add -rtlib=compiler-rt to tests in baremetal.cpp

Author: saturn691

clang/test/Driver/baremetal.cpp

@@ -163,12 +163,12 @@
 // RUN:   | FileCheck %s --check-prefix=CHECK-RTLIB-GCC
 // CHECK-RTLIB-GCC: -lgcc
 
-// RUN: %clang -### --target=arm-none-eabi -nolibc %s 2>&1 \
+// RUN: %clang -### --target=arm-none-eabi -nolibc -rtlib=compiler-rt %s 2>&1 \
 // RUN:   | FileCheck %s --check-prefix=CHECK-NOLIBC
 // CHECK-NOLIBC-NOT: "-lc"
 // CHECK-NOLIBC: "{{[^"]*}}libclang_rt.builtins.a"
 
-// RUN: %clang -### --target=arm-none-eabi -nostdlib %s 2>&1 \
+// RUN: %clang -### --target=arm-none-eabi -nostdlib -rtlib=compiler-rt %s 2>&1 \
 // RUN:   | FileCheck %s --check-prefix=CHECK-NOSTDLIB
 // CHECK-NOSTDLIB-NOT: "-lc"
 // CHECK-NOSTDLIB-NOT: "{{[^"]*}}libclang_rt.builtins.a"