X87: [turbofan] Fix calls to computed code objects.

    port 924b0ecf (r31057).

    contributed by zhengxing.li@intel.com

    original commit message:

BUG=

Review URL: https://codereview.chromium.org/1408893002

Cr-Commit-Position: refs/heads/master@{#31321}

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

@@ -312,7 +312,8 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
         __ call(code, RelocInfo::CODE_TARGET);
       } else {
         Register reg = i.InputRegister(0);
-        __ call(Operand(reg, Code::kHeaderSize - kHeapObjectTag));
+        __ add(reg, Immediate(Code::kHeaderSize - kHeapObjectTag));
+        __ call(reg);
       }
       RecordCallPosition(instr);
       bool double_result =