[AArch64] Remove command-line option use for testing.

The EXTR combine has been in tree for over 2 years without complain, so go ahead
and remove the option.

llvm-svn: 269292

llvm/lib/Target/AArch64/AArch64ISelLowering.cpp

@@ -40,12 +40,6 @@ using namespace llvm;
 STATISTIC(NumTailCalls, "Number of tail calls");
 STATISTIC(NumShiftInserts, "Number of vector shift inserts");
 
-// Place holder until extr generation is tested fully.
-static cl::opt<bool>
-EnableAArch64ExtrGeneration("aarch64-extr-generation", cl::Hidden,
-                          cl::desc("Allow AArch64 (or (shift)(shift))->extract"),
-                          cl::init(true));
-
 static cl::opt<bool>
 EnableAArch64SlrGeneration("aarch64-shift-insert-generation", cl::Hidden,
                            cl::desc("Allow AArch64 SLI/SRI formation"),
@@ -7992,8 +7986,6 @@ static SDValue tryCombineToBSL(SDNode *N,
 static SDValue performORCombine(SDNode *N, TargetLowering::DAGCombinerInfo &DCI,
                                 const AArch64Subtarget *Subtarget) {
   // Attempt to form an EXTR from (or (shl VAL1, #N), (srl VAL2, #RegWidth-N))
-  if (!EnableAArch64ExtrGeneration)
-    return SDValue();
   SelectionDAG &DAG = DCI.DAG;
   EVT VT = N->getValueType(0);
 

llvm/test/CodeGen/AArch64/arm64-extract.ll

@@ -1,4 +1,4 @@
-; RUN: llc -aarch64-extr-generation=true -verify-machineinstrs < %s \
+; RUN: llc -verify-machineinstrs < %s \
 ; RUN: -march=arm64 | FileCheck %s
 
 define i64 @ror_i64(i64 %in) {