X87: enable the X87 turbofan support.

src/compiler/x87/linkage-x87.cc

Index: src/compiler/x87/linkage-x87.cc
diff --git a/src/compiler/ia32/linkage-ia32.cc b/src/compiler/x87/linkage-x87.cc
similarity index 96%
copy from src/compiler/ia32/linkage-ia32.cc
copy to src/compiler/x87/linkage-x87.cc
index bfe201bf6fcbdbd6a963a28113a2a2b02e7f1910..ec702ccbf05b86f2937022261e564d519f88f6ab 100644
--- a/src/compiler/ia32/linkage-ia32.cc
+++ b/src/compiler/x87/linkage-x87.cc
@@ -12,7 +12,7 @@ namespace v8 {
 namespace internal {
 namespace compiler {
 
-struct IA32LinkageHelperTraits {
+struct X87LinkageHelperTraits {
   static Register ReturnValueReg() { return eax; }
   static Register ReturnValue2Reg() { return edx; }
   static Register JSCallFunctionReg() { return edi; }
@@ -26,7 +26,7 @@ struct IA32LinkageHelperTraits {
   static int CRegisterParametersLength() { return 0; }
 };
 
-typedef LinkageHelper<IA32LinkageHelperTraits> LH;
+typedef LinkageHelper<X87LinkageHelperTraits> LH;
 
 CallDescriptor* Linkage::GetJSCallDescriptor(Zone* zone, bool is_osr,
                                              int parameter_count,