Bug 1358214 - gettid wrapper is not provided by any libc in linux r=njn

BIONIC is only platform that actually supports gettid. Easiest
    solution is to check for linux and disable for BIONIC platform. This
    includes the change requested by Gerald to keep the two profilers  sync'd.

Differential Revision: https://phabricator.services.mozilla.com/D34919

--HG--
extra : moz-landing-system : lando

mozglue/baseprofiler/core/platform-linux-android.cpp

@@ -76,7 +76,7 @@ int profiler_current_process_id() { return getpid(); }
 
 int profiler_current_thread_id() {
   // glibc doesn't provide a wrapper for gettid().
-#if defined(__GLIBC__)
+#if defined(__linux__) || !defined(__BIONIC__)
   return static_cast<int>(static_cast<pid_t>(syscall(SYS_gettid)));
 #else
   return static_cast<int>(gettid());

tools/profiler/core/platform-linux-android.cpp

@@ -73,7 +73,7 @@ int profiler_current_process_id() { return getpid(); }
 
 int profiler_current_thread_id() {
   // glibc doesn't provide a wrapper for gettid().
-#if defined(__GLIBC__)
+#if defined(__linux__) || !defined(__BIONIC__)
   return static_cast<int>(static_cast<pid_t>(syscall(SYS_gettid)));
 #else
   return static_cast<int>(gettid());