[mips][cleanup] Eliminate non-const reference parameters

Port ab0f9710

Original Commit Message:

    - Eliminates non-const reference parameters in test/cctest.

Change-Id: I038314e0cc2b28e70e7ebcbd2d076ef62893285e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1795646
Commit-Queue: Mu Tao <pamilty@gmail.com>
Commit-Queue: Bill Budge <bbudge@chromium.org>
Auto-Submit: Mu Tao <pamilty@gmail.com>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63664}

test/cctest/test-assembler-mips64.cc

@@ -10549,11 +10549,11 @@ void run_msa_3rf(const struct TestCaseMsa3RF* input,
   msa_reg_t res;
 
   load_elements_of_vector(
-      assm, reinterpret_cast<const uint64_t*>(&input->ws_lo), w0, t0, t1);
+      &assm, reinterpret_cast<const uint64_t*>(&input->ws_lo), w0, t0, t1);
   load_elements_of_vector(
-      assm, reinterpret_cast<const uint64_t*>(&input->wt_lo), w1, t0, t1);
+      &assm, reinterpret_cast<const uint64_t*>(&input->wt_lo), w1, t0, t1);
   load_elements_of_vector(
-      assm, reinterpret_cast<const uint64_t*>(&input->wd_lo), w2, t0, t1);
+      &assm, reinterpret_cast<const uint64_t*>(&input->wd_lo), w2, t0, t1);
   Generate2RInstructionFunc(assm);
   store_elements_of_vector(&assm, w2, a0);