[PATCH] [ASan] Add process basename to log name and error message to simplify analysis of sanitized systems logs.

[Alexey Samsonov]

LGTM


REPOSITORY
  rL LLVM

================
Comment at: lib/sanitizer_common/sanitizer_printf.cc:277
@@ -272,2 +276,3 @@
+    CHECK_NEEDED_LENGTH
     // If the message fit into the buffer, print it and exit.
     break;
----------------
#undef macro here?

http://reviews.llvm.org/D7333

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