[turbofan] Fix calls to computed code objects.

src/compiler/ia32/code-generator-ia32.cc

Index: src/compiler/ia32/code-generator-ia32.cc
diff --git a/src/compiler/ia32/code-generator-ia32.cc b/src/compiler/ia32/code-generator-ia32.cc
index d4fe21505c4fd7971c1ea97580680cf698a58819..d67be6bff99d96cd43d443c7a01ad620d6eebef3 100644
--- a/src/compiler/ia32/code-generator-ia32.cc
+++ b/src/compiler/ia32/code-generator-ia32.cc
@@ -308,7 +308,8 @@ 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);
       break;