[loong64][simulator] Fix some floating_point ops implementation

Due to differences in compiler versions and optimization levels,
std::floor treats snan differently, as does std::ceil and std::trunc.
So the implementation of some instructions is sometimes inconsistent
with the physical machine. We add extra processing to them.

Besides, fix Loong64Debugger::Debug error in simulator, IsTrap
returns true only if break is encountered.

Change-Id: I240d91ed658645a2453162107b6dd172735fbfef
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3661259Reviewed-by: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Auto-Submit: Liu Yu <liuyu@loongson.cn>
Cr-Commit-Position: refs/heads/main@{#80714}

src/codegen/loong64/constants-loong64.h

@@ -1276,7 +1276,8 @@ InstructionBase::Type InstructionBase::InstructionType() const {
 
 template <class P>
 bool InstructionGetters<P>::IsTrap() const {
-  return true;
+  if ((this->Bits(31, 15) << 15) == BREAK) return true;
+  return false;
 }
 
 }  // namespace internal

src/execution/loong64/simulator-loong64.h

@@ -209,6 +209,13 @@ class Simulator : public SimulatorBase {
   // for each native thread.
   V8_EXPORT_PRIVATE static Simulator* current(v8::internal::Isolate* isolate);
 
+  float ceil(float value);
+  float floor(float value);
+  float trunc(float value);
+  double ceil(double value);
+  double floor(double value);
+  double trunc(double value);
+
   // Accessors for register state. Reading the pc value adheres to the LOONG64
   // architecture specification and is off by a 8 from the currently executing
   // instruction.