[AArch64][GlobalISel] Remove duplicate attribute lookup code that was supposed to be cached. NFC.

aemerson · aemerson · commit 44b496758f17 · 2020-01-23T15:50:08.000-08:00
When I cached this a long time ago it seems I forgot to remove the locally
declared variable of the same name in select(), so the caching wasn't having
any compile time benefit. Doh.
diff --git a/llvm/lib/Target/AArch64/AArch64InstructionSelector.cpp b/llvm/lib/Target/AArch64/AArch64InstructionSelector.cpp
@@ -1517,8 +1517,6 @@ bool AArch64InstructionSelector::select(MachineInstr &I) {
     // Speculation tracking/SLH assumes that optimized TB(N)Z/CB(N)Z
     // instructions will not be produced, as they are conditional branch
     // instructions that do not set flags.
-    bool ProduceNonFlagSettingCondBr =
-        !MF.getFunction().hasFnAttribute(Attribute::SpeculativeLoadHardening);
     if (ProduceNonFlagSettingCondBr && selectCompareBranch(I, MF, MRI))
       return true;
 
