[gardening] Fix trampoline near jump to far jump.

Fuchsia has slightly more code in FfiCallbackTrampoline, so near jump don't work, has to be far jump.

Fixes #60682
TEST=ci

Change-Id: Iaabdcfe59c821eeed00fff7faf1dbd661145922b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/426905
Commit-Queue: Alexander Aprelev <[email protected]>
Reviewed-by: Ryan Macnak <[email protected]>

Author: aam

runtime/vm/compiler/stub_code_compiler_x64.cc

@@ -536,12 +536,12 @@ void StubCodeCompiler::GenerateFfiCallbackTrampolineStub() {
   // If GetFfiCallbackMetadata returned a null thread, it means that the
   // callback was invoked after it was deleted. In this case, do nothing.
   __ cmpq(THR, Immediate(0));
-  __ j(EQUAL, &done, Assembler::kFarJump);
+  __ j(EQUAL, &done);
 
   // Check the trampoline type to see how the callback should be invoked.
   __ cmpq(RAX, Immediate(static_cast<uword>(
                    FfiCallbackMetadata::TrampolineType::kAsync)));
-  __ j(EQUAL, &async_callback, Assembler::kNearJump);
+  __ j(EQUAL, &async_callback);
 
   __ cmpq(RAX,
           Immediate(static_cast<uword>(

runtime/vm/ffi_callback_metadata.h

@@ -291,7 +291,7 @@ class FfiCallbackMetadata {
 
 #if defined(TARGET_ARCH_X64)
   static constexpr intptr_t kNativeCallbackTrampolineSize = 12;
-  static constexpr intptr_t kNativeCallbackSharedStubSize = 338;
+  static constexpr intptr_t kNativeCallbackSharedStubSize = 376;
   static constexpr intptr_t kNativeCallbackTrampolineStackDelta = 2;
 #elif defined(TARGET_ARCH_IA32)
   static constexpr intptr_t kNativeCallbackTrampolineSize = 10;