Replace APFloatBase static fltSemantics data members with getter functions

At least the plugin used by the LibreOffice build
(<https://wiki.documentfoundation.org/Development/Clang_plugins>) indirectly
uses those members (through inline functions in LLVM/Clang include files in turn
using them), but they are not exported by utils/extract_symbols.py on Windows,
and accessing data across DLL/EXE boundaries on Windows is generally
problematic.

Differential Revision: https://reviews.llvm.org/D26671

llvm-svn: 289647
diff --git a/llvm/lib/CodeGen/MachineInstr.cpp b/llvm/lib/CodeGen/MachineInstr.cpp
index 4567654..56fa41e 100644
--- a/llvm/lib/CodeGen/MachineInstr.cpp
+++ b/llvm/lib/CodeGen/MachineInstr.cpp
@@ -401,7 +401,7 @@
     } else if (getFPImm()->getType()->isHalfTy()) {
       APFloat APF = getFPImm()->getValueAPF();
       bool Unused;
-      APF.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &Unused);
+      APF.convert(APFloat::IEEEsingle(), APFloat::rmNearestTiesToEven, &Unused);
       OS << "half " << APF.convertToFloat();
     } else {
       OS << getFPImm()->getValueAPF().convertToDouble();