[Sanitizers] Make sanitizer allocator linker-initialize compliant.

Summary:
These four SpinMutex ctors was the only code executed in the ctor for
the static __asan::Allocator instance (same for the other sanitizers
allocators), which is supposed to be fully linker-initialized.

Also, when the global ctor for this allocator instance is executed,
this instance might already be initialized by __asan_init called from
.preinit_array.

Issue: https://github.com/google/sanitizers/issues/194

Reviewers: morehouse, eugenis, cryptoad

Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits

Differential Revision: https://reviews.llvm.org/D48142

llvm-svn: 334660

1 files changed, 1 insertions, 1 deletions

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_allocator_secondary.h b/compiler-rt/lib/sanitizer_common/sanitizer_allocator_secondary.h
index db52bf565a5..ab680b5e2d1 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_allocator_secondary.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_allocator_secondary.h
@@ -314,6 +314,6 @@ class LargeMmapAllocator {
   struct Stats {
     uptr n_allocs, n_frees, currently_allocated, max_allocated, by_size_log[64];
   } stats;
-  SpinMutex mutex_;
+  StaticSpinMutex mutex_;
 };