[asan] Set the darwin deployment target for the dead-strip test

[zaks.anna]

Summary

ASan dead-strip support relies on a linker option that only exists in 10.11 and later, so the LLVM instrumentation checks for the deployment target. This test does not pass when clang is built to choose lower deployment target by default but runs on newer host.

(Note, the REQUIRES: osx-ld64-live_support clause only checks the host and not the target OS.)

compiler-rt/trunk/test/asan/TestCases/Darwin/dead-strip.c

 // Test that AddressSanitizer does not re-animate dead globals when dead
 // stripping is turned on.
 //
 // This test verifies that an out-of-bounds access on a global variable is
 // detected after dead stripping has been performed. This proves that the
 // runtime is able to register globals in the __DATA,__asan_globals section.
 
 // REQUIRES: osx-ld64-live_support
-// RUN: %clang_asan -mllvm -asan-globals-live-support -Xlinker -dead_strip -o %t %s
+// RUN: %clang_asan -mmacosx-version-min=10.11 -mllvm -asan-globals-live-support -Xlinker -dead_strip -o %t %s
 // RUN: llvm-nm -format=posix %t | FileCheck --check-prefix NM-CHECK %s
 // RUN: not %run %t 2>&1 | FileCheck --check-prefix ASAN-CHECK %s
 
 int alive[1] = {};
 int dead[1] = {};
 // NM-CHECK: {{^_alive }}
 // NM-CHECK-NOT: {{^_dead }}
 
 int main(int argc, char *argv[]) {
   alive[argc] = 0;
   // ASAN-CHECK: {{0x.* is located 0 bytes to the right of global variable}}
   return 0;
 }