Skip TestMinusRSymsWithSameName testpoint on MIPS for the time being
since it triggers failures on that arch. Will re-enable once the
problems are fixed.

Updates #35779.

Change-Id: I3e6650158ab04a2be77e3db5a5194df3bbb0859e
Reviewed-on: https://go-review.googlesource.com/c/go/+/208557Reviewed-by: Cherry Zhang <cherryyz@google.com>