Replacing HUGE_VALF with llvm::huge_valf in order to work around a warning triggered in MSVC 12.

Patch reviewed by Reid Kleckner and Jim Grosbach.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194533 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/Spiller.cpp

@@ -77,7 +77,7 @@ protected:
 
     DEBUG(dbgs() << "Spilling everywhere " << *li << "\n");
 
-    assert(li->weight != HUGE_VALF &&
+    assert(li->weight != llvm::huge_valf &&
            "Attempting to spill already spilled value.");
 
     assert(!TargetRegisterInfo::isStackSlot(li->reg) &&