Revert "ART: Implement hard float for X86"

This reverts commit 59b9cf7ec0ccc13df91be0bd5c723b8c52410739.

Change-Id: I08333b528032480def474286dc368d916a07e17f
diff --git a/compiler/dex/quick/x86/codegen_x86.h b/compiler/dex/quick/x86/codegen_x86.h
index b7fa2d2..c7d83dd 100644
--- a/compiler/dex/quick/x86/codegen_x86.h
+++ b/compiler/dex/quick/x86/codegen_x86.h
@@ -39,15 +39,22 @@
     }
    protected:
     Mir2Lir* m2l_;
+   private:
     size_t cur_core_reg_;
     size_t cur_fp_reg_;
   };
 
-  class InToRegStorageX86Mapper : public InToRegStorageX86_64Mapper {
+  class InToRegStorageX86Mapper : public InToRegStorageMapper {
    public:
-    explicit InToRegStorageX86Mapper(Mir2Lir* m2l)
-        : InToRegStorageX86_64Mapper(m2l) { }
+    explicit InToRegStorageX86Mapper(Mir2Lir* m2l) : m2l_(m2l), cur_core_reg_(0) {}
     virtual RegStorage GetNextReg(ShortyArg arg);
+    virtual void Reset() OVERRIDE {
+      cur_core_reg_ = 0;
+    }
+   protected:
+    Mir2Lir* m2l_;
+   private:
+    size_t cur_core_reg_;
   };
 
   InToRegStorageX86_64Mapper in_to_reg_storage_x86_64_mapper_;
@@ -111,12 +118,9 @@
       if (cu_->target64) {
         return As64BitReg(TargetReg32(symbolic_reg));
       } else {
-        if (symbolic_reg >= kFArg0 && symbolic_reg <= kFArg3) {
-          // We want an XMM, not a pair.
-          return As64BitReg(TargetReg32(symbolic_reg));
-        }
         // x86: construct a pair.
         DCHECK((kArg0 <= symbolic_reg && symbolic_reg < kArg3) ||
+               (kFArg0 <= symbolic_reg && symbolic_reg < kFArg3) ||
                (kRet0 == symbolic_reg));
         return RegStorage::MakeRegPair(TargetReg32(symbolic_reg),
                                  TargetReg32(static_cast<SpecialTargetRegister>(symbolic_reg + 1)));