BPF: Implement TTI.getCmpSelInstrCost() properly

The Select insn in BPF is expensive as BPF backend
needs to resolve with conditionals.  This patch set
the getCmpSelInstrCost() to SCEVCheapExpansionBudget
for Select insn to prevent some Select insn related
optimizations.

This change is motivated during bcc code review for
   iovisor/bcc#3270
where IndVarSimplifyPass eventually caused generating
the following asm code:
  ;       for (i = 0; (i < VIRTIO_MAX_SGS) && (i < num); i++) {
      14:       16 05 40 00 00 00 00 00 if w5 == 0 goto +64 <LBB0_6>
      15:       bc 51 00 00 00 00 00 00 w1 = w5
      16:       04 01 00 00 ff ff ff ff w1 += -1
      17:       67 05 00 00 20 00 00 00 r5 <<= 32
      18:       77 05 00 00 20 00 00 00 r5 >>= 32
      19:       a6 01 01 00 05 00 00 00 if w1 < 5 goto +1 <LBB0_4>
      20:       b7 05 00 00 06 00 00 00 r5 = 6
  00000000000000a8 <LBB0_4>:
      21:       b7 02 00 00 00 00 00 00 r2 = 0
      22:       b7 01 00 00 00 00 00 00 r1 = 0
  ;       for (i = 0; (i < VIRTIO_MAX_SGS) && (i < num); i++) {
      23:       7b 1a e0 ff 00 00 00 00 *(u64 *)(r10 - 32) = r1
      24:       7b 5a c0 ff 00 00 00 00 *(u64 *)(r10 - 64) = r5
Note that insn #15 has w1 = w5 and w1 is refined later but r5(w5) is
eventually saved on stack at insn #24 for later use. This cause
later verifier failures.

With this change, IndVarSimplifyPass won't do the above
transformation any more.

Differential Revision: https://reviews.llvm.org/D97479

llvm/lib/Target/BPF/BPFTargetTransformInfo.h

@@ -18,6 +18,7 @@
 #include "BPFTargetMachine.h"
 #include "llvm/Analysis/TargetTransformInfo.h"
 #include "llvm/CodeGen/BasicTTIImpl.h"
+#include "llvm/Transforms/Utils/ScalarEvolutionExpander.h"
 
 namespace llvm {
 class BPFTTIImpl : public BasicTTIImplBase<BPFTTIImpl> {
@@ -42,6 +43,17 @@ class BPFTTIImpl : public BasicTTIImplBase<BPFTTIImpl> {
 
     return TTI::TCC_Basic;
   }
+
+  int getCmpSelInstrCost(unsigned Opcode, Type *ValTy, Type *CondTy,
+                         CmpInst::Predicate VecPred,
+                         TTI::TargetCostKind CostKind,
+                         const llvm::Instruction *I = nullptr) {
+    if (Opcode == Instruction::Select)
+      return SCEVCheapExpansionBudget;
+
+    return BaseT::getCmpSelInstrCost(Opcode, ValTy, CondTy, VecPred, CostKind,
+                                     I);
+  }
 };
 
 } // end namespace llvm