X87: [turbofan] Add initial support for SOFT deopts.

  port 7a22fdff(r32690)

  original commit message:
  This only introduces the basic support for both SOFT and EAGER deopts in
  TurboFan, but doesn't make use of SOFT deopts anywhere yet (there are
  some other issues blocking that). Basically every Deoptimize operator
  now has a DeoptimizeKind, which can be either kSoft or kEager.

BUG=

Review URL: https://codereview.chromium.org/1508323002

Cr-Commit-Position: refs/heads/master@{#32694}

src/compiler/x87/code-generator-x87.cc

@@ -505,7 +505,9 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       __ fild_s(MemOperand(esp, 0));
       __ lea(esp, Operand(esp, kPointerSize));
 
-      AssembleDeoptimizerCall(deopt_state_id, Deoptimizer::EAGER);
+      Deoptimizer::BailoutType bailout_type =
+          Deoptimizer::BailoutType(MiscField::decode(instr->opcode()));
+      AssembleDeoptimizerCall(deopt_state_id, bailout_type);
       break;
     }
     case kArchRet: