tsan: improve detection of stack/tls races

Print meaningful stack frames for stack/tls races
(instead of PC 1/2 that don't symbolize).

Imitate stack/tls writes after we create and initialize
the new thread, otherwise the races are not detected.

This is re-submit of the following reverted commits,
but without tests as they failed on a number of OSes/arches:
"tsan: fix and test detection of TLS races"
"tsan: fix tls_race3 test on darwin"
"tsan: print a meaningful frame for stack races"

Differential Revision: https://reviews.llvm.org/D111147