[mips] Remove XFAIL from sanitizer_coverage_no_prune.cc
Test is XPASSing, so remove the XFAIL marker.
//
// REQUIRES: has_sancovcc,stable-runtime
// UNSUPPORTED: i386-darwin
-// XFAIL: tsan,mips
+// XFAIL: tsan
//
// RUN: %clangxx -O0 %s -S -o - -emit-llvm -fsanitize-coverage=trace-pc,bb,no-prune 2>&1 | grep "call void @__sanitizer_cov_trace_pc" | count 3
// RUN: %clangxx -O0 %s -S -o - -emit-llvm -fsanitize-coverage=trace-pc,bb 2>&1 | grep "call void @__sanitizer_cov_trace_pc" | count 2
