[Sanitizer] Allow builtins for Cross-DSO CFI on Android

[phosek]

Summary

This is needed to avoid the test failure in case when compiler-rt
is set as the default runtime library for Clang.

[eugenis]

See my comment in https://reviews.llvm.org/D44655, but this change is also fine with me.

[phosek]

That link seems to be pointing to this change?

[eugenis]

Indeed!
https://reviews.llvm.org/D44645

[phosek]

I was actually thinking about doing the same now, more specifically using -rtlib=platform which is already used elsewhere in this test. Do you prefer one or the other?

[eugenis]

Since the test is about cfi, not builtins, I think it's better to check for the cfi library explicitly.

[phosek]

SGTM, I've made the test even more explicit.

[eugenis]

LGTM

test/Driver/sanitizer-ld.c

 // CHECK-CFI-CROSS-DSO-DIAG-LINUX: -export-dynamic
 
 // Cross-DSO CFI on Android does not link runtime libraries.
 // RUN: %clang -fsanitize=cfi -fsanitize-cfi-cross-dso %s -### -o %t.o 2>&1 \
 // RUN:     -target aarch64-linux-android -fuse-ld=ld \
 // RUN:     --sysroot=%S/Inputs/basic_android_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-CFI-CROSS-DSO-ANDROID %s
 // CHECK-CFI-CROSS-DSO-ANDROID: "{{.*}}ld{{(.exe)?}}"
-// CHECK-CFI-CROSS-DSO-ANDROID-NOT: libclang_rt.
+// CHECK-CFI-CROSS-DSO-ANDROID-NOT: libclang_rt.cfi
 
 // Cross-DSO CFI with diagnostics on Android links just the UBSAN runtime.
 // RUN: %clang -fsanitize=cfi -fsanitize-cfi-cross-dso %s -### -o %t.o 2>&1 \
 // RUN:     -fno-sanitize-trap=cfi -fsanitize-recover=cfi \
 // RUN:     -target aarch64-linux-android -fuse-ld=ld \
 // RUN:     --sysroot=%S/Inputs/basic_android_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-CFI-CROSS-DSO-DIAG-ANDROID %s
 // CHECK-CFI-CROSS-DSO-DIAG-ANDROID: "{{.*}}ld{{(.exe)?}}"