another long double buglet



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42159 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86FloatingPoint.cpp b/lib/Target/X86/X86FloatingPoint.cpp
index 179a71e..90813b5 100644
--- a/lib/Target/X86/X86FloatingPoint.cpp
+++ b/lib/Target/X86/X86FloatingPoint.cpp
@@ -619,6 +619,7 @@
        MI->getOpcode() == X86::ISTT_Fp16m64 ||
        MI->getOpcode() == X86::ISTT_Fp32m64 ||
        MI->getOpcode() == X86::ISTT_Fp64m64 ||
+       MI->getOpcode() == X86::IST_Fp64m80 ||
        MI->getOpcode() == X86::ISTT_Fp16m80 ||
        MI->getOpcode() == X86::ISTT_Fp32m80 ||
        MI->getOpcode() == X86::ISTT_Fp64m80 ||