Add -static-libasan alias for -static-libsan. (llvm#98194)

This helps compatibility with gcc, which has (static|shared)-libasan,
but not *-libsan.

Clang currently has
  -shared-libasan
  -shared-libsan
  -static-libsan

This change improves consistency by adding
  -static-libasan

Author: eugenis

clang/include/clang/Driver/Options.td

@@ -1618,6 +1618,7 @@ def shared_libsan : Flag<["-"], "shared-libsan">,
 def static_libsan : Flag<["-"], "static-libsan">,
   HelpText<"Statically link the sanitizer runtime (Not supported for ASan, TSan or UBSan on darwin)">;
 def : Flag<["-"], "shared-libasan">, Alias<shared_libsan>;
+def : Flag<["-"], "static-libasan">, Alias<static_libsan>;
 def fasm : Flag<["-"], "fasm">, Group<f_Group>;
 
 defm assume_unique_vtables : BoolFOption<"assume-unique-vtables",

clang/test/Driver/sanitizer-ld.c

@@ -196,6 +196,13 @@
 // RUN:     -static-libsan \
 // RUN:   | FileCheck --check-prefix=CHECK-ASAN-ANDROID-STATICLIBASAN %s
 //
+// RUN: %clang -### %s 2>&1 \
+// RUN:     --target=arm-linux-androideabi -fuse-ld=ld -fsanitize=address \
+// RUN:     --sysroot=%S/Inputs/basic_android_tree/sysroot \
+// RUN:     -resource-dir=%S/Inputs/resource_dir \
+// RUN:     -static-libasan \
+// RUN:   | FileCheck --check-prefix=CHECK-ASAN-ANDROID-STATICLIBASAN %s
+//
 // CHECK-ASAN-ANDROID-STATICLIBASAN: "{{(.*[^.0-9A-Z_a-z])?}}ld.lld{{(.exe)?}}"
 // CHECK-ASAN-ANDROID-STATICLIBASAN: libclang_rt.asan.a"
 // CHECK-ASAN-ANDROID-STATICLIBASAN-NOT: "-lpthread"