[ubsan] Enable -fsanitize=function on Darwin

[vsk]

Summary

Depends on D37597

Compiler-rt test update:

fsan-darwin-enable-crt.diff1 KBDownload

compiler-rt/trunk/test/ubsan/TestCases/TypeCheck/Function/function.cpp

 // RUN: %clangxx -fsanitize=function %s -O3 -g -o %t
 // RUN: %run %t 2>&1 | FileCheck %s
 // Verify that we can disable symbolization if needed:
 // RUN: %env_ubsan_opts=symbolize=0 %run %t 2>&1 | FileCheck %s --check-prefix=NOSYM
 
-// -fsanitize=function is unsupported on Darwin yet.
-// XFAIL: darwin
-
 #include <stdint.h>
 
 void f() {}
 
 void g(int x) {}
 
 void make_valid_call() {
   // CHECK-NOT: runtime error: call to function g
   reinterpret_cast<void (*)(int)>(reinterpret_cast<uintptr_t>(g))(42);
 }
 
 void make_invalid_call() {
-  // CHECK: function.cpp:25:3: runtime error: call to function f() through pointer to incorrect function type 'void (*)(int)'
-  // CHECK-NEXT: function.cpp:11: note: f() defined here
-  // NOSYM: function.cpp:25:3: runtime error: call to function (unknown) through pointer to incorrect function type 'void (*)(int)'
+  // CHECK: function.cpp:[[@LINE+4]]:3: runtime error: call to function f() through pointer to incorrect function type 'void (*)(int)'
+  // CHECK-NEXT: function.cpp:[[@LINE-11]]: note: f() defined here
+  // NOSYM: function.cpp:[[@LINE+2]]:3: runtime error: call to function (unknown) through pointer to incorrect function type 'void (*)(int)'
   // NOSYM-NEXT: ({{.*}}+0x{{.*}}): note: (unknown) defined here
   reinterpret_cast<void (*)(int)>(reinterpret_cast<uintptr_t>(f))(42);
 }
 
 int main(void) {
   make_valid_call();
   make_invalid_call();
   // Check that no more errors will be printed.
   // CHECK-NOT: runtime error: call to function
   // NOSYM-NOT: runtime error: call to function
   make_invalid_call();
 }