PPC/s390: [ptr-compr][turbofan] Make compressions no-ops

Port 1821aff2

Original Commit Message:

    Since we can just use the lower bits, we can make the compressions no-ops.
    As a note, they still change the representation so that the machine graph
    verifier is happy.

    X64's version of: https://chromium-review.googlesource.com/c/v8/v8/+/1751722

R=solanes@chromium.org, joransiu@ca.ibm.com, junyan@redhat.com, midawson@redhat.com
BUG=
LOG=N

Change-Id: I414fa30a17e5af4fa5b3e84b1b321d890431f27e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3100587Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#76349}

src/compiler/backend/ppc/instruction-codes-ppc.h

@@ -138,9 +138,6 @@ namespace compiler {
   V(PPC_StoreSimd128)                \
   V(PPC_ByteRev32)                   \
   V(PPC_ByteRev64)                   \
-  V(PPC_CompressSigned)              \
-  V(PPC_CompressPointer)             \
-  V(PPC_CompressAny)                 \
   V(PPC_AtomicExchangeUint8)         \
   V(PPC_AtomicExchangeUint16)        \
   V(PPC_AtomicExchangeWord32)        \

src/compiler/backend/ppc/instruction-scheduler-ppc.cc

@@ -112,9 +112,6 @@ int InstructionScheduler::GetTargetInstructionFlags(
     case kPPC_BitcastDoubleToInt64:
     case kPPC_ByteRev32:
     case kPPC_ByteRev64:
-    case kPPC_CompressSigned:
-    case kPPC_CompressPointer:
-    case kPPC_CompressAny:
     case kPPC_F64x2Splat:
     case kPPC_F64x2ExtractLane:
     case kPPC_F64x2ReplaceLane:

src/compiler/backend/s390/instruction-codes-s390.h

@@ -161,9 +161,6 @@ namespace compiler {
   V(S390_StoreReverseSimd128)               \
   V(S390_StoreFloat32)                      \
   V(S390_StoreDouble)                       \
-  V(S390_CompressSigned)                    \
-  V(S390_CompressPointer)                   \
-  V(S390_CompressAny)                       \
   V(S390_Word64AtomicExchangeUint64)        \
   V(S390_Word64AtomicCompareExchangeUint64) \
   V(S390_Word64AtomicAddUint64)             \

src/compiler/backend/s390/instruction-scheduler-s390.cc

@@ -135,9 +135,6 @@ int InstructionScheduler::GetTargetInstructionFlags(
     case kS390_LoadAndTestWord64:
     case kS390_LoadAndTestFloat32:
     case kS390_LoadAndTestFloat64:
-    case kS390_CompressSigned:
-    case kS390_CompressPointer:
-    case kS390_CompressAny:
     case kS390_F64x2Splat:
     case kS390_F64x2ReplaceLane:
     case kS390_F64x2Abs: