Move the new test added in 2095655 to its own file

... and set an explicit target triple.

Should fix buildbot issues like:

https://lab.llvm.org/buildbot/#/builders/245/builds/20379/steps/5/logs/FAIL__Clang__warn-unused-filescoped_cpp

Author: jroelofs

clang/test/SemaCXX/warn-unused-filescoped-fmv.cpp

@@ -0,0 +1,18 @@
+// RUN: %clang_cc1 -triple arm64-apple-darwin -fsyntax-only -verify -Wunused -std=c++98 %s
+// RUN: %clang_cc1 -triple arm64-apple-darwin -fsyntax-only -verify -Wunused -std=c++14 %s
+
+__attribute__((target_version("fp16")))
+static int not_used_fmv(void) { return 1; }
+__attribute__((target_version("fp16fml")))
+static int not_used_fmv(void) { return 2; }
+__attribute__((target_version("default")))
+static int not_used_fmv(void) { return 0; } // expected-warning {{unused function 'not_used_fmv'}}
+
+
+__attribute__((target_version("fp16")))
+static int definitely_used_fmv(void) { return 1; }
+__attribute__((target_version("fp16fml")))
+static int definitely_used_fmv(void) { return 2; }
+__attribute__((target_version("default")))
+static int definitely_used_fmv(void) { return 0; }
+int definite_user(void) { return definitely_used_fmv(); }

clang/test/SemaCXX/warn-unused-filescoped.cpp

@@ -236,20 +236,4 @@ constexpr int constexpr4() { return 2; }
 #endif
 }
 
-__attribute__((target_version("fp16")))
-static int not_used_fmv(void) { return 1; }
-__attribute__((target_version("fp16fml")))
-static int not_used_fmv(void) { return 2; }
-__attribute__((target_version("default")))
-static int not_used_fmv(void) { return 0; } // expected-warning {{unused function 'not_used_fmv'}}
-
-
-__attribute__((target_version("fp16")))
-static int definitely_used_fmv(void) { return 1; }
-__attribute__((target_version("fp16fml")))
-static int definitely_used_fmv(void) { return 2; }
-__attribute__((target_version("default")))
-static int definitely_used_fmv(void) { return 0; }
-int definite_user(void) { return definitely_used_fmv(); }
-
 #endif