[MIPS] Get (ptrace) value of $pc for a thread

This change is fixing LinuxPtraceDumperTest.SanitizeStackCopy
test case.

Change-Id: I1eb3becfd4b3660bc5529b5d2a5e35db0b6eb6e0
Reviewed-on: https://chromium-review.googlesource.com/458277
Reviewed-by: Mark Mentovai <mark@chromium.org>
Cr-Mirrored-From: https://chromium.googlesource.com/breakpad/breakpad
Cr-Mirrored-Commit: 77411db895405ebd3daa8cb19c2683ce0f5e9737
1 file changed