Cherry-pick gtest fix for asan tests.
Clone+exec death test allocates a single page of stack to run chdir + exec on.
This is not enough when gtest is built with ASan and run on particular
With ASan on x86_64, ExecDeathTestChildMain has frame size of 1728 bytes.
Call to chdir() in ExecDeathTestChildMain ends up in
_dl_runtime_resolve_xsavec, which attempts to save register state on the stack;
according to cpuid(0xd) XSAVE register save area size is 2568 on my machine.
This results in something like this in all death tests:
Result: died but not with expected error. ... [ DEATH ] AddressSanitizer:DEADLYSIGNAL [ DEATH ] ================================================================= [ DEATH ] ==178637==ERROR: AddressSanitizer: stack-overflow on address ...
Differential Revision: https://reviews.llvm.org/D70332