[arm64][Liftoff] add AbortCompilation

When a liftoff function bails out after generating some constant pool,
this avoids to trigger a check in the Assembler destructor.

Bug: v8:6600

Change-Id: I79c595605bc0add1f3f5617ac7feedf162081d8a
Reviewed-on: https://chromium-review.googlesource.com/1026647Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Vincent Belliard <vincent.belliard@arm.com>
Cr-Commit-Position: refs/heads/master@{#52815}

src/wasm/baseline/liftoff-compiler.cc

@@ -1839,6 +1839,12 @@ wasm::WasmCode* LiftoffCompilationUnit::FinishCompilation(
   return code;
 }
 
+void LiftoffCompilationUnit::AbortCompilation() {
+  // The compilation is aborted. Put the assembler in a clean mode before
+  // its deletion.
+  asm_.FinishCode();
+}
+
 #undef __
 #undef TRACE
 #undef WASM_INSTANCE_OBJECT_OFFSET

src/wasm/baseline/liftoff-compiler.h

@@ -22,6 +22,7 @@ class LiftoffCompilationUnit final {
 
   bool ExecuteCompilation();
   wasm::WasmCode* FinishCompilation(wasm::ErrorThrower*);
+  void AbortCompilation();
 
  private:
   WasmCompilationUnit* const wasm_unit_;

src/wasm/function-compiler.cc

@@ -117,6 +117,7 @@ void WasmCompilationUnit::SwitchMode(CompilationMode new_mode) {
       return;
     case CompilationMode::kTurbofan:
       DCHECK(!turbofan_unit_);
+      if (liftoff_unit_ != nullptr) liftoff_unit_->AbortCompilation();
       liftoff_unit_.reset();
       turbofan_unit_.reset(new compiler::TurbofanWasmCompilationUnit(this));
       return;