PPC: Support different PPC platforms with function descriptors

Change-Id: I9a91bd41bc4429509457d73c78fc88e2cf826fb6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2248202Reviewed-by: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#68391}

src/compiler/backend/instruction-selector.cc

@@ -2845,7 +2845,7 @@ void InstructionSelector::VisitCall(Node* node, BasicBlock* handler) {
   switch (call_descriptor->kind()) {
     case CallDescriptor::kCallAddress: {
       int misc_field = static_cast<int>(call_descriptor->ParameterCount());
-#if defined(_AIX)
+#if ABI_USES_FUNCTION_DESCRIPTORS
       // Highest misc_field bit is used on AIX to indicate if a CFunction call
       // has function descriptor or not.
       if (!call_descriptor->NoFunctionDescriptor()) {

src/compiler/backend/ppc/code-generator-ppc.cc

@@ -1039,7 +1039,7 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
           linkage()->GetIncomingDescriptor()->IsWasmCapiFunction();
       int offset = (FLAG_enable_embedded_constant_pool ? 20 : 23) * kInstrSize;
 
-#if defined(_AIX)
+#if ABI_USES_FUNCTION_DESCRIPTORS
       // AIX/PPC64BE Linux uses a function descriptor
       int kNumParametersMask = kHasFunctionDescriptorBitMask - 1;
       num_parameters = kNumParametersMask & misc_field;

src/execution/simulator.h

@@ -128,7 +128,7 @@ class GeneratedCode {
 #if defined(V8_TARGET_OS_WIN) && !defined(V8_OS_WIN)
     FATAL("Generated code execution not possible during cross-compilation.");
 #endif  // defined(V8_TARGET_OS_WIN) && !defined(V8_OS_WIN)
-#if V8_OS_AIX
+#if ABI_USES_FUNCTION_DESCRIPTORS
     // AIX ABI requires function descriptors (FD).  Artificially create a pseudo
     // FD to ensure correct dispatch to generated code.  The 'volatile'
     // declaration is required to avoid the compiler from not observing the
@@ -140,7 +140,7 @@ class GeneratedCode {
     return fn(args...);
 #else
     return fn_ptr_(args...);
-#endif  // V8_OS_AIX
+#endif  // ABI_USES_FUNCTION_DESCRIPTORS
   }
 #endif  // USE_SIMULATOR