Handle NetBSD symbol mangling for nanosleep and vfork

Summary:
Native code generated on NetBSD mangles:

 - vfork into __vfork14
 - nanosleep into __nanosleep50

Handle this accordingly in TSan.

Reviewers: vitalybuka, dvyukov, joerg

Reviewed By: vitalybuka

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

Tags: #sanitizers

Differential Revision: https://reviews.llvm.org/D53806

llvm-svn: 345570

compiler-rt/lib/tsan/rtl/tsan_interceptors.cc

@@ -53,6 +53,8 @@ using namespace __tsan;  // NOLINT
 #define stdout ((char*)&__sF + (__sF_size * 1))
 #define stderr ((char*)&__sF + (__sF_size * 2))
 
+#define nanosleep __nanosleep50
+#define vfork __vfork14
 #endif
 
 #if SANITIZER_ANDROID