Unbreak mingw build. Patch by Viktor Kutuzov.

llvm-svn: 74212

llvm/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp

@@ -637,7 +637,7 @@ void
 ARMAsmPrinter::printBitfieldInvMaskImmOperand(const MachineInstr *MI, int Op) {
   const MachineOperand &MO = MI->getOperand(Op);
   uint32_t v = ~MO.getImm();
-  int32_t lsb = ffs (v) - 1;
+  int32_t lsb = CountTrailingZeros_32(v);
   int32_t width = (32 - CountLeadingZeros_32 (v)) - lsb;
   assert(MO.isImm() && "Not a valid bf_inv_mask_imm value!");
   O << "#" << lsb << ", #" << width;