Fix pointer-compression related #defines

1) Ensure 31bit Smis are enabled if pointer compression is.
2) Enable some code for 31bit Smis

Bug: v8:8344
Change-Id: Ib1e68ebfcfd49e16d1548879b7670c88dc73449b
Reviewed-on: https://chromium-review.googlesource.com/c/1445979
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59248}

BUILD.gn

@@ -339,7 +339,7 @@ config("features") {
   if (v8_enable_pointer_compression) {
     defines += [ "V8_COMPRESS_POINTERS" ]
   }
-  if (v8_enable_31bit_smis_on_64bit_arch) {
+  if (v8_enable_pointer_compression || v8_enable_31bit_smis_on_64bit_arch) {
     defines += [ "V8_31BIT_SMIS_ON_64BIT_ARCH" ]
   }
   if (v8_enable_object_print) {

src/arm64/macro-assembler-arm64.cc

@@ -2007,7 +2007,7 @@ void TurboAssembler::CallBuiltinPointer(Register builtin_pointer) {
 
   // The builtin_pointer register contains the builtin index as a Smi.
   // Untagging is folded into the indexing operand below.
-#ifdef V8_COMPRESS_POINTERS
+#if defined(V8_COMPRESS_POINTERS) || defined(V8_31BIT_SMIS_ON_64BIT_ARCH)
   STATIC_ASSERT(kSmiShiftSize == 0);
   Lsl(builtin_pointer, builtin_pointer, kSystemPointerSizeLog2 - kSmiShift);
 #else

src/x64/macro-assembler-x64.cc

@@ -1619,7 +1619,7 @@ void TurboAssembler::CallBuiltinPointer(Register builtin_pointer) {
   // of times_8 since smis are already shifted by one).
   Call(Operand(kRootRegister, builtin_pointer, times_4,
                IsolateData::builtin_entry_table_offset()));
-#else   // V8_COMPRESS_POINTERS
+#else   // defined(V8_COMPRESS_POINTERS) || defined(V8_31BIT_SMIS_ON_64BIT_ARCH)
   STATIC_ASSERT(kSmiShiftSize == 31);
   STATIC_ASSERT(kSmiTagSize == 1);
   STATIC_ASSERT(kSmiTag == 0);