[NFC][CFI] Avoid clang error in CFI tests (#135981)

In these tests we test correct linking flags set,
and it's confusing that command fails because of
other missing required flags.

Clang diagnostics opportunistically proceed after
error report on required flags, but there is no
guaranty that processing of tested flags are the same
in supported and erroneous flag sets.

Author: vitalybuka

clang/test/Driver/sanitizer-ld.c

@@ -840,7 +840,8 @@
 // CHECK-CFI-PREREQ-LINUX: '-fsanitize=cfi' only allowed with '-fvisibility='
 
 // CFI by itself does not link runtime libraries.
-// RUN: not %clang -fsanitize=cfi \
+// RUN: %clang -fsanitize=cfi \
+// RUN:     -flto -fvisibility=hidden \
 // RUN:     --target=x86_64-unknown-linux -fuse-ld=ld -rtlib=platform \
 // RUN:     -resource-dir=%S/Inputs/resource_dir \
 // RUN:     --sysroot=%S/Inputs/basic_linux_tree \
@@ -849,7 +850,8 @@
 // CHECK-CFI-LINUX: "{{.*}}ld{{(.exe)?}}"
 
 // CFI with diagnostics links the UBSan runtime.
-// RUN: not %clang -fsanitize=cfi -fno-sanitize-trap=cfi -fsanitize-recover=cfi \
+// RUN: %clang -fsanitize=cfi -fno-sanitize-trap=cfi -fsanitize-recover=cfi \
+// RUN:     -flto -fvisibility=hidden \
 // RUN:     --target=x86_64-unknown-linux -fuse-ld=ld \
 // RUN:     -resource-dir=%S/Inputs/resource_dir \
 // RUN:     --sysroot=%S/Inputs/basic_linux_tree \
@@ -859,7 +861,8 @@
 // CHECK-CFI-DIAG-LINUX: "--whole-archive" "{{[^"]*}}libclang_rt.ubsan_standalone.a" "--no-whole-archive"
 
 // Cross-DSO CFI links the CFI runtime.
-// RUN: not %clang -fsanitize=cfi -fsanitize-cfi-cross-dso \
+// RUN: %clang -fsanitize=cfi -fsanitize-cfi-cross-dso \
+// RUN:     -flto -fvisibility=hidden \
 // RUN:     --target=x86_64-unknown-linux -fuse-ld=ld \
 // RUN:     -resource-dir=%S/Inputs/resource_dir \
 // RUN:     --sysroot=%S/Inputs/basic_linux_tree \
@@ -870,7 +873,8 @@
 // CHECK-CFI-CROSS-DSO-LINUX: -export-dynamic
 
 // Cross-DSO CFI with diagnostics links just the CFI runtime.
-// RUN: not %clang -fsanitize=cfi -fsanitize-cfi-cross-dso \
+// RUN: %clang -fsanitize=cfi -fsanitize-cfi-cross-dso \
+// RUN:     -flto -fvisibility=hidden \
 // RUN:     -fno-sanitize-trap=cfi -fsanitize-recover=cfi \
 // RUN:     --target=x86_64-unknown-linux -fuse-ld=ld \
 // RUN:     -resource-dir=%S/Inputs/resource_dir \
@@ -882,7 +886,8 @@
 // CHECK-CFI-CROSS-DSO-DIAG-LINUX: -export-dynamic
 
 // Cross-DSO CFI on Android does not link runtime libraries.
-// RUN: not %clang -fsanitize=cfi -fsanitize-cfi-cross-dso \
+// RUN: %clang -fsanitize=cfi -fsanitize-cfi-cross-dso \
+// RUN:     -flto -fvisibility=hidden \
 // RUN:     --target=aarch64-linux-android -fuse-ld=ld \
 // RUN:     -resource-dir=%S/Inputs/resource_dir \
 // RUN:     --sysroot=%S/Inputs/basic_android_tree \
@@ -891,7 +896,8 @@
 // CHECK-CFI-CROSS-DSO-ANDROID: "{{.*}}ld{{(.exe)?}}"
 
 // Cross-DSO CFI with diagnostics on Android links just the UBSAN runtime.
-// RUN: not %clang -fsanitize=cfi -fsanitize-cfi-cross-dso \
+// RUN: %clang -fsanitize=cfi -fsanitize-cfi-cross-dso \
+// RUN:     -flto -fvisibility=hidden \
 // RUN:     -fno-sanitize-trap=cfi -fsanitize-recover=cfi \
 // RUN:     --target=aarch64-linux-android -fuse-ld=ld \
 // RUN:     -resource-dir=%S/Inputs/resource_dir \