[PATCH] [LSan] [MIPS] adding support of LSan for mips64/mips64el arch

[Sergey Matveev]

lgtm with nits

Please don't forget to implement clone().


REPOSITORY
  rL LLVM

================
Comment at: lib/sanitizer_common/sanitizer_linux_libcdep.cc:168
@@ +167,3 @@
+// head structure. It lies before the static tls blocks.
+uptr TlsPreTcbSize() {
+  const uptr kTcbHead = 16;
----------------
static

================
Comment at: lib/sanitizer_common/tests/sanitizer_linux_test.cc:260
@@ +259,3 @@
+TEST(SanitizerLinux, ThreadSelfTest) {
+  ASSERT_EQ(pthread_self(), ThreadSelf());
+}
----------------
This needs a comment:

// Effectively, this is a test for ThreadDescriptorSize() which is used to compute ThreadSelf().

http://reviews.llvm.org/D7013

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