TF: Clear upper bits of ConvertFloat64ToUint32 because Win64.

src/compiler/x64/linkage-x64.cc

Index: src/compiler/x64/linkage-x64.cc
diff --git a/src/compiler/x64/linkage-x64.cc b/src/compiler/x64/linkage-x64.cc
index 3a92bb16c7a1a8abef0faa1f714f5c3de259a65c..7d34ef2cfae42b602fe2ce5105f790897c52cc92 100644
--- a/src/compiler/x64/linkage-x64.cc
+++ b/src/compiler/x64/linkage-x64.cc
@@ -14,6 +14,12 @@ namespace v8 {
 namespace internal {
 namespace compiler {
 
+#ifdef _WIN64
+const bool kWin64 = true;
+#else
+const bool kWin64 = false;
+#endif
+
 struct LinkageHelperTraits {
   static Register ReturnValueReg() { return rax; }
   static Register ReturnValue2Reg() { return rdx; }
@@ -21,26 +27,24 @@ struct LinkageHelperTraits {
   static Register ContextReg() { return rsi; }
   static Register RuntimeCallFunctionReg() { return rbx; }
   static Register RuntimeCallArgCountReg() { return rax; }
-#ifdef _WIN64
   static RegList CCalleeSaveRegisters() {
-    return rbx.bit() | rdi.bit() | rsi.bit() | r12.bit() | r13.bit() |
-           r14.bit() | r15.bit();
+    if (kWin64) {
+      return rbx.bit() | rdi.bit() | rsi.bit() | r12.bit() | r13.bit() |
+             r14.bit() | r15.bit();
+    } else {
+      return rbx.bit() | r12.bit() | r13.bit() | r14.bit() | r15.bit();
+    }
   }
   static Register CRegisterParameter(int i) {
-    static Register register_parameters[] = {rcx, rdx, r8, r9};
-    return register_parameters[i];
+    if (kWin64) {
+      static Register register_parameters[] = {rcx, rdx, r8, r9};
+      return register_parameters[i];
+    } else {
+      static Register register_parameters[] = {rdi, rsi, rdx, rcx, r8, r9};
+      return register_parameters[i];
+    }
   }
-  static int CRegisterParametersLength() { return 4; }
-#else
-  static RegList CCalleeSaveRegisters() {
-    return rbx.bit() | r12.bit() | r13.bit() | r14.bit() | r15.bit();
-  }
-  static Register CRegisterParameter(int i) {
-    static Register register_parameters[] = {rdi, rsi, rdx, rcx, r8, r9};
-    return register_parameters[i];
-  }
-  static int CRegisterParametersLength() { return 6; }
-#endif
+  static int CRegisterParametersLength() { return kWin64 ? 4 : 6; }
 };