MIPS[64]: Fix failing several Liftoff tests

Failing test are: cctest/cctest/test-run-wasm/RunWasmLiftoff*.
Test started to fail after this commit: 56b8ab5d
This patch also fixes MIPS big endian build failure.

Change-Id: I333450f2a8f9c9a61db9aea18e5e973f48742d52
Reviewed-on: https://chromium-review.googlesource.com/c/1286348Reviewed-by: Ivica Bogosavljevic <ibogosavljevic@wavecomp.com>
Commit-Queue: Ivica Bogosavljevic <ibogosavljevic@wavecomp.com>
Cr-Commit-Position: refs/heads/master@{#56742}

src/wasm/baseline/mips/liftoff-assembler-mips.h

@@ -403,6 +403,9 @@ void LiftoffAssembler::Store(Register dst_addr, Register offset_reg,
   Register dst = no_reg;
   MemOperand dst_op = MemOperand(dst_addr, offset_imm);
   if (offset_reg != no_reg) {
+    if (is_store_mem) {
+      pinned.set(src);
+    }
     dst = GetUnusedRegister(kGpReg, pinned).gp();
     emit_ptrsize_add(dst, dst_addr, offset_reg);
     dst_op = MemOperand(dst, offset_imm);
@@ -410,7 +413,7 @@ void LiftoffAssembler::Store(Register dst_addr, Register offset_reg,
 
 #if defined(V8_TARGET_BIG_ENDIAN)
   if (is_store_mem) {
-    pinned |= LiftoffRegList::ForRegs(dst_op.rm(), src);
+    pinned = pinned | LiftoffRegList::ForRegs(dst_op.rm(), src);
     LiftoffRegister tmp = GetUnusedRegister(src.reg_class(), pinned);
     // Save original value.
     Move(tmp, src, type.value_type());

src/wasm/baseline/mips64/liftoff-assembler-mips64.h

@@ -340,6 +340,9 @@ void LiftoffAssembler::Store(Register dst_addr, Register offset_reg,
   Register dst = no_reg;
   MemOperand dst_op = MemOperand(dst_addr, offset_imm);
   if (offset_reg != no_reg) {
+    if (is_store_mem) {
+      pinned.set(src);
+    }
     dst = GetUnusedRegister(kGpReg, pinned).gp();
     emit_ptrsize_add(dst, dst_addr, offset_reg);
     dst_op = MemOperand(dst, offset_imm);