[wasm][arm64] Fix {WasmGrowMemory} builtin to avoid Aborts.

This changes the ARM64-specific {TurboAssembler::AssertSpAligned} helper
to not generate calls to the {Abort} builtin. It is needed to ensure all
WebAssembly runtime stubs (e.g. {WasmGrowMemory}) are independent of the
Isolate. In general calling the {Abort} builtin without a valid frame
being present will produce bogus debug messages anyways. Hence we just
unconditionally use traps for the debug code in question.

R=sigurds@chromium.org

Change-Id: I93eb87e8b87209da8506c9b28e2c800950d1118a
Reviewed-on: https://chromium-review.googlesource.com/1140170
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54496}

src/arm64/macro-assembler-arm64.cc

@@ -1428,7 +1428,8 @@ void MacroAssembler::PopCalleeSavedRegisters() {
 }
 
 void TurboAssembler::AssertSpAligned() {
-  if (emit_debug_code() && use_real_aborts()) {
+  if (emit_debug_code()) {
+    TrapOnAbortScope trap_on_abort_scope(this);  // Avoid calls to Abort.
     // Arm64 requires the stack pointer to be 16-byte aligned prior to address
     // calculation.
     UseScratchRegisterScope scope(this);