[compiler] Ask compilation info, not isolate, about source positions flag.

MIPS port of https://chromium-review.googlesource.com/c/519165/.

R=ivica.bogosavljevic@imgtec.com, jarin@chromium.org

Bug: v8:6048
Change-Id: I27c8b43726119904441f286a6c97d602fd2d0150
Reviewed-on: https://chromium-review.googlesource.com/530806Reviewed-by: Ivica Bogosavljevic <ivica.bogosavljevic@imgtec.com>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45863}

src/compiler/mips/code-generator-mips.cc

@@ -2687,7 +2687,7 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleDeoptimizerCall(
   Address deopt_entry = Deoptimizer::GetDeoptimizationEntry(
       isolate(), deoptimization_id, bailout_type);
   if (deopt_entry == nullptr) return kTooManyDeoptimizationBailouts;
-  if (isolate()->NeedsSourcePositionsForProfiling()) {
+  if (info()->is_source_positions_enabled()) {
     __ RecordDeoptReason(deoptimization_reason, pos, deoptimization_id);
   }
   __ Call(deopt_entry, RelocInfo::RUNTIME_ENTRY);

src/compiler/mips64/code-generator-mips64.cc

@@ -3021,7 +3021,7 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleDeoptimizerCall(
   Address deopt_entry = Deoptimizer::GetDeoptimizationEntry(
       isolate(), deoptimization_id, bailout_type);
   if (deopt_entry == nullptr) return kTooManyDeoptimizationBailouts;
-  if (isolate()->NeedsSourcePositionsForProfiling()) {
+  if (info()->is_source_positions_enabled()) {
     __ RecordDeoptReason(deoptimization_reason, pos, deoptimization_id);
   }
   __ Call(deopt_entry, RelocInfo::RUNTIME_ENTRY);