x86-Win32: Switch ftol2 calling convention from stdcall to C.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117474 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index f698cec..d293081 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -104,8 +104,8 @@
     setLibcallName(RTLIB::FPTOUINT_F32_I64, "_ftol2");
     setLibcallCallingConv(RTLIB::SDIV_I64, CallingConv::X86_StdCall);
     setLibcallCallingConv(RTLIB::UDIV_I64, CallingConv::X86_StdCall);
-    setLibcallCallingConv(RTLIB::FPTOUINT_F64_I64, CallingConv::X86_StdCall);
-    setLibcallCallingConv(RTLIB::FPTOUINT_F32_I64, CallingConv::X86_StdCall);
+    setLibcallCallingConv(RTLIB::FPTOUINT_F64_I64, CallingConv::C);
+    setLibcallCallingConv(RTLIB::FPTOUINT_F32_I64, CallingConv::C);
   }
 
   if (Subtarget->isTargetDarwin()) {