tsan: extend mmap test

[dvyukov]

Summary

Test size larger than clear_shadow_mmap_threshold,
which is handled differently.

Depends on D114348.

compiler-rt/test/tsan/ignored-interceptors-mmap.cpp

 // RUN: %clangxx_tsan -O0 %s -o %t
-// RUN: not %run %t        2>&1 | FileCheck %s --check-prefix=CHECK-RACE
-// RUN:     %run %t ignore 2>&1 | FileCheck %s --check-prefix=CHECK-IGNORE
+// RUN: not %run %t          2>&1 | FileCheck %s --check-prefix=CHECK-RACE
+// Test size larger than clear_shadow_mmap_threshold, which is handled differently.
+// RUN: not %run %t - 262144 2>&1 | FileCheck %s --check-prefix=CHECK-RACE
+// RUN:     %run %t ignore   2>&1 | FileCheck %s --check-prefix=CHECK-IGNORE
 
 #include <sys/mman.h>
 #include <string.h>
 #include <assert.h>
 #include <atomic>
 
 #include "test.h"
 
 // Use atomic to ensure we do not have a race for the pointer value itself.  We
 // only want to check races in the mmap'd memory to isolate the test that mmap
 // respects ignore annotations.
 std::atomic<int*> global_p;
 
-void mmap_ignored(bool ignore) {
-  const size_t kSize = sysconf(_SC_PAGESIZE);
-
+void mmap_ignored(bool ignore, size_t size) {
   if (ignore) AnnotateIgnoreWritesBegin(__FILE__, __LINE__);
-  void *p = mmap(0, kSize, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
+  void *p =
+      mmap(0, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
   if (ignore) AnnotateIgnoreWritesEnd(__FILE__, __LINE__);
 
   // Use relaxed to retain the race between the mmap call and the memory write
   global_p.store((int *)p, std::memory_order_relaxed);
   barrier_wait(&barrier);
 }
 
 void *WriteToMemory(void *unused) {
   barrier_wait(&barrier);
   global_p[0] = 7;
   return 0;
 }
 
 // Create race between allocating (mmap) and writing memory
 int main(int argc, const char *argv[]) {
   bool ignore = (argc > 1) && (strcmp(argv[1], "ignore") == 0);
+  size_t size = argc > 2 ? atoi(argv[2]) : sysconf(_SC_PAGESIZE);
 
   barrier_init(&barrier, 2);
   pthread_t t;
   pthread_create(&t, 0, WriteToMemory, 0);
-  mmap_ignored(ignore);
+  mmap_ignored(ignore, size);
   pthread_join(t, 0);
 
   assert(global_p[0] == 7);
   printf("OK\n");
   return 0;
 }
 
 // CHECK-RACE: WARNING: ThreadSanitizer: data race
 // CHECK-RACE: OK
 // CHECK-IGNORE-NOT: WARNING: ThreadSanitizer: data race
 // CHECK-IGNORE: OK