[NFC][SPIRV][IRTranslator] Replace leftover MF->getTarget().getTargetTriple().isSPIRV() with targetSupportsBF16Type(MF) (llvm#167704)

Author: jmmartinez

llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp

@@ -3482,7 +3482,7 @@ bool IRTranslator::translateAtomicCmpXchg(const User &U,
 
 bool IRTranslator::translateAtomicRMW(const User &U,
                                       MachineIRBuilder &MIRBuilder) {
-  if (!MF->getTarget().getTargetTriple().isSPIRV() && containsBF16Type(U))
+  if (containsBF16Type(U) && !targetSupportsBF16Type(MF))
     return false;
 
   const AtomicRMWInst &I = cast<AtomicRMWInst>(U);