[deoptimizer] Remove obsolete DeoptInfo::mnemonic field.

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/1945363002
Cr-Commit-Position: refs/heads/master@{#36069}

src/crankshaft/lithium-codegen.cc

@@ -374,7 +374,7 @@ void LCodeGenBase::LogDeoptCallPosition(int pc_offset, int inlining_id) {
 Deoptimizer::DeoptInfo LCodeGenBase::MakeDeoptInfo(
     LInstruction* instr, Deoptimizer::DeoptReason deopt_reason) {
   Deoptimizer::DeoptInfo deopt_info(instr->hydrogen_value()->position(),
-                                    instr->Mnemonic(), deopt_reason);
+                                    deopt_reason);
   HEnterInlined* enter_inlined = instr->environment()->entry();
   deopt_info.inlining_id = enter_inlined ? enter_inlined->inlining_id() : 0;
   return deopt_info;

src/deoptimizer.cc

@@ -2651,7 +2651,7 @@ Deoptimizer::DeoptInfo Deoptimizer::GetDeoptInfo(Code* code, Address pc) {
              RelocInfo::ModeMask(RelocInfo::POSITION);
   for (RelocIterator it(code, mask); !it.done(); it.next()) {
     RelocInfo* info = it.rinfo();
-    if (info->pc() >= pc) return DeoptInfo(last_position, NULL, last_reason);
+    if (info->pc() >= pc) return DeoptInfo(last_position, last_reason);
     if (info->rmode() == RelocInfo::POSITION) {
       int raw_position = static_cast<int>(info->data());
       last_position = raw_position ? SourcePosition::FromRaw(raw_position)
@@ -2660,7 +2660,7 @@ Deoptimizer::DeoptInfo Deoptimizer::GetDeoptInfo(Code* code, Address pc) {
       last_reason = static_cast<Deoptimizer::DeoptReason>(info->data());
     }
   }
-  return DeoptInfo(SourcePosition::Unknown(), NULL, Deoptimizer::kNoReason);
+  return DeoptInfo(SourcePosition::Unknown(), Deoptimizer::kNoReason);
 }
 
 

src/deoptimizer.h

@@ -410,11 +410,10 @@ class Deoptimizer : public Malloced {
   static const char* GetDeoptReason(DeoptReason deopt_reason);
 
   struct DeoptInfo {
-    DeoptInfo(SourcePosition position, const char* m, DeoptReason d)
-        : position(position), mnemonic(m), deopt_reason(d), inlining_id(0) {}
+    DeoptInfo(SourcePosition position, DeoptReason d)
+        : position(position), deopt_reason(d), inlining_id(0) {}
 
     SourcePosition position;
-    const char* mnemonic;
     DeoptReason deopt_reason;
     int inlining_id;
   };