ARM: Canonicalize access to function attributes, NFC

Canonicalize access to function attributes to use the simpler API.

getAttributes().getAttribute(AttributeSet::FunctionIndex, Kind)
  => getFnAttribute(Kind)

getAttributes().hasAttribute(AttributeSet::FunctionIndex, Kind)
  => hasFnAttribute(Kind)

llvm-svn: 229220
diff --git a/llvm/lib/Target/ARM/ARMSubtarget.cpp b/llvm/lib/Target/ARM/ARMSubtarget.cpp
index a2c4736..a82b9f2 100644
--- a/llvm/lib/Target/ARM/ARMSubtarget.cpp
+++ b/llvm/lib/Target/ARM/ARMSubtarget.cpp
@@ -348,6 +348,5 @@
   // immediates as it is inherently position independent, and may be out of
   // range otherwise.
   return UseMovt && (isTargetWindows() ||
-                     !MF.getFunction()->getAttributes().hasAttribute(
-                         AttributeSet::FunctionIndex, Attribute::MinSize));
+                     !MF.getFunction()->hasFnAttribute(Attribute::MinSize));
 }