Fix baremetal.cpp test to handle windows paths.

Author: kbeyls

clang/test/Driver/baremetal.cpp

@@ -108,9 +108,9 @@
 // Verify that the bare metal driver does not include any host system paths:
 // CHECK-AARCH64-NO-HOST-INC: InstalledDir: [[INSTALLEDDIR:.+]]
 // CHECK-AARCH64-NO-HOST-INC: "-resource-dir" "[[RESOURCE:[^"]+]]"
-// CHECK-AARCH64-NO-HOST-INC-SAME: "-internal-isystem" "[[INSTALLEDDIR]]/../lib/clang-runtimes/aarch64-none-elf/include/c++/v1"
-// CHECK-AARCH64-NO-HOST-INC-SAME: "-internal-isystem" "[[RESOURCE]]/include"
-// CHECK-AARCH64-NO-HOST-INC-SAME: "-internal-isystem" "[[INSTALLEDDIR]]/../lib/clang-runtimes/aarch64-none-elf/include"
+// CHECK-AARCH64-NO-HOST-INC-SAME: "-internal-isystem" "[[INSTALLEDDIR]]{{[/\\]+}}..{{[/\\]+}}lib{{[/\\]+}}clang-runtimes{{[/\\]+}}aarch64-none-elf{{[/\\]+}}include{{[/\\]+}}c++{{[/\\]+}}v1"
+// CHECK-AARCH64-NO-HOST-INC-SAME: "-internal-isystem" "[[RESOURCE]]{{[/\\]+}}include"
+// CHECK-AARCH64-NO-HOST-INC-SAME: "-internal-isystem" "[[INSTALLEDDIR]]{{[/\\]+}}..{{[/\\]+}}lib{{[/\\]+}}clang-runtimes{{[/\\]+}}aarch64-none-elf{{[/\\]+}}include"
 
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     -target riscv64-unknown-elf \