[builtins] Increase default buffer size

MSVC is not happy about conditionally increasing the buffer size for
builtin code generation with --code-comments.

Previous CL: https://crrev.com/c/2976651

Change-Id: Ic257eecfc9c41835d8ae4cf2de595fd5c427a7e2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2992721Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75450}

src/builtins/setup-builtins-internal.cc

@@ -31,6 +31,8 @@ BUILTIN_LIST_C(FORWARD_DECLARE)
 
 namespace {
 
+const int kBufferSize = 128 * KB;
+
 AssemblerOptions BuiltinAssemblerOptions(Isolate* isolate, Builtin builtin) {
   AssemblerOptions options = AssemblerOptions::Default(isolate);
   CHECK(!options.isolate_independent_code);
@@ -59,7 +61,6 @@ using CodeAssemblerGenerator = void (*)(compiler::CodeAssemblerState*);
 
 Handle<Code> BuildPlaceholder(Isolate* isolate, Builtin builtin) {
   HandleScope scope(isolate);
-  const int kBufferSize = FLAG_code_comments ? 128 * KB : 1 * KB;
   byte buffer[kBufferSize];
   MacroAssembler masm(isolate, CodeObjectRequired::kYes,
                       ExternalAssemblerBuffer(buffer, kBufferSize));
@@ -87,7 +88,6 @@ Code BuildWithMacroAssembler(Isolate* isolate, Builtin builtin,
   // Canonicalize handles, so that we can share constant pool entries pointing
   // to code targets without dereferencing their handles.
   CanonicalHandleScope canonical(isolate);
-  const int kBufferSize = FLAG_code_comments ? 128 * KB : 32 * KB;
   byte buffer[kBufferSize];
 
   MacroAssembler masm(isolate, BuiltinAssemblerOptions(isolate, builtin),
@@ -130,7 +130,6 @@ Code BuildAdaptor(Isolate* isolate, Builtin builtin, Address builtin_address,
   // Canonicalize handles, so that we can share constant pool entries pointing
   // to code targets without dereferencing their handles.
   CanonicalHandleScope canonical(isolate);
-  const int kBufferSize = FLAG_code_comments ? 128 * KB : 32 * KB;
   byte buffer[kBufferSize];
   MacroAssembler masm(isolate, BuiltinAssemblerOptions(isolate, builtin),
                       CodeObjectRequired::kYes,