Specify target in lifetime-asan test.

[vitalybuka]

Summary

Some target platforms -fsanitize=address.

[yaron.keren]

You mean
Some target platforms do not support -fsanitize=address.

[christof]

I've tested it and it removes the issue I saw. The following error is gone:
clang-3.9: error: unsupported option '-fsanitize=address' for target 'aarch64-arm-none-eabi’

Thanks

cfe/trunk/test/CodeGen/lifetime-asan.c

-// RUN: %clang -S -emit-llvm -o - -O0 %s | FileCheck %s -check-prefix=CHECK-O0
-// RUN: %clang -S -emit-llvm -o - -O0 \
+// RUN: %clang -target x86_64-linux-gnu -S -emit-llvm -o - -O0 %s | FileCheck %s -check-prefix=CHECK-O0
+// RUN: %clang -target x86_64-linux-gnu -S -emit-llvm -o - -O0 \
 // RUN:     -fsanitize=address -fsanitize-address-use-after-scope %s | \
 // RUN:     FileCheck %s -check-prefix=CHECK-ASAN-USE-AFTER-SCOPE
-// UNSUPPORTED: mingw32
 
 extern int bar(char *A, int n);
 
 // CHECK-O0-NOT: @llvm.lifetime.start
 int foo(int n) {
   if (n) {
     // CHECK-ASAN-USE-AFTER-SCOPE: @llvm.lifetime.start(i64 10, i8* {{.*}})
     char A[10];