Cleanup a few magic numbers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163263 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index 362d99a..e40aee5 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -970,7 +970,7 @@
 InlineAsm::AsmDialect MachineInstr::getInlineAsmDialect() const {
   assert(isInlineAsm() && "getInlineAsmDialect() only works for inline asms!");
   unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
-  return InlineAsm::AsmDialect((ExtraInfo >> 2) & 1);
+  return InlineAsm::AsmDialect((ExtraInfo & InlineAsm::Extra_AsmDialect) != 0);
 }
 
 int MachineInstr::findInlineAsmFlagIdx(unsigned OpIdx,