[google] ThreadSanitizer instrumentation pass (issue 5303083)

[davidxl@google.com]

http://codereview.appspot.com/5303083/diff/28001/gcc/tree-tsan.c
File gcc/tree-tsan.c (right):

http://codereview.appspot.com/5303083/diff/28001/gcc/tree-tsan.c#newcode227
gcc/tree-tsan.c:227: var = varpool_node_for_asm (id);
Use cgraph_node_for_asm instead.

http://codereview.appspot.com/5303083/