Redesign the frame layout for LoongArch64/ARM64/RISCV64 to avoid the

redundant computation of the stackOffsets.
After the `lvaAssignVirtualFrameOffsetsToLocals`, there is no need to
recompute the LclVarDsc's StackOffset within the `lvaFixVirtualFrameOffsets`.

Author: shushanhf

src/coreclr/jit/codegen.h

@@ -402,27 +402,6 @@ class CodeGen final : public CodeGenInterface
 
     FuncletFrameInfoDsc genFuncletInfo;
 
-#elif defined(TARGET_ARM64)
-
-    // A set of information that is used by funclet prolog and epilog generation. It is collected once, before
-    // funclet prologs and epilogs are generated, and used by all funclet prologs and epilogs, which must all be the
-    // same.
-    struct FuncletFrameInfoDsc
-    {
-        regMaskTP fiSaveRegs;                // Set of callee-saved registers saved in the funclet prolog (includes LR)
-        int fiFunction_CallerSP_to_FP_delta; // Delta between caller SP and the frame pointer in the parent function
-                                             // (negative)
-        int fiSP_to_FPLR_save_delta;         // FP/LR register save offset from SP (positive)
-        int fiSP_to_PSP_slot_delta;          // PSP slot offset from SP (positive)
-        int fiSP_to_CalleeSave_delta;        // First callee-saved register slot offset from SP (positive)
-        int fiCallerSP_to_PSP_slot_delta;    // PSP slot offset from Caller SP (negative)
-        int fiFrameType;                     // Funclet frame types are numbered. See genFuncletProlog() for details.
-        int fiSpDelta1;                      // Stack pointer delta 1 (negative)
-        int fiSpDelta2;                      // Stack pointer delta 2 (negative)
-    };
-
-    FuncletFrameInfoDsc genFuncletInfo;
-
 #elif defined(TARGET_AMD64)
 
     // A set of information that is used by funclet prolog and epilog generation. It is collected once, before
@@ -437,26 +416,7 @@ class CodeGen final : public CodeGenInterface
 
     FuncletFrameInfoDsc genFuncletInfo;
 
-#elif defined(TARGET_LOONGARCH64)
-
-    // A set of information that is used by funclet prolog and epilog generation.
-    // It is collected once, before funclet prologs and epilogs are generated,
-    // and used by all funclet prologs and epilogs, which must all be the same.
-    struct FuncletFrameInfoDsc
-    {
-        regMaskTP fiSaveRegs;                // Set of callee-saved registers saved in the funclet prolog (includes RA)
-        int fiFunction_CallerSP_to_FP_delta; // Delta between caller SP and the frame pointer in the parent function
-                                             // (negative)
-        int fiSP_to_CalleeSaved_delta;       // CalleeSaved register save offset from SP (positive)
-        int fiCalleeSavedPadding;            // CalleeSaved offset padding (positive)
-        int fiSP_to_PSP_slot_delta;          // PSP slot offset from SP (positive)
-        int fiCallerSP_to_PSP_slot_delta;    // PSP slot offset from Caller SP (negative)
-        int fiSpDelta;                       // Stack pointer delta (negative)
-    };
-
-    FuncletFrameInfoDsc genFuncletInfo;
-
-#elif defined(TARGET_RISCV64)
+#elif defined(TARGET_LOONGARCH64) || defined(TARGET_ARM64) || defined(TARGET_RISCV64)
 
     // A set of information that is used by funclet prolog and epilog generation.
     // It is collected once, before funclet prologs and epilogs are generated,
@@ -467,7 +427,6 @@ class CodeGen final : public CodeGenInterface
         int fiFunction_CallerSP_to_FP_delta; // Delta between caller SP and the frame pointer in the parent function
                                              // (negative)
         int fiSP_to_CalleeSaved_delta;       // CalleeSaved register save offset from SP (positive)
-        int fiCalleeSavedPadding;            // CalleeSaved offset padding (positive)
         int fiSP_to_PSP_slot_delta;          // PSP slot offset from SP (positive)
         int fiCallerSP_to_PSP_slot_delta;    // PSP slot offset from Caller SP (negative)
         int fiSpDelta;                       // Stack pointer delta (negative)
@@ -658,13 +617,6 @@ class CodeGen final : public CodeGenInterface
 
 #endif // defined(DEBUG)
 
-#ifdef TARGET_ARM64
-    virtual void SetSaveFpLrWithAllCalleeSavedRegisters(bool value);
-    virtual bool IsSaveFpLrWithAllCalleeSavedRegisters() const;
-    bool         genSaveFpLrWithAllCalleeSavedRegisters;
-    bool         genForceFuncletFrameType5;
-#endif // TARGET_ARM64
-
     //-------------------------------------------------------------------------
     //
     // End prolog/epilog generation
@@ -1272,7 +1224,6 @@ class CodeGen final : public CodeGenInterface
     void        genJmpMethod(GenTree* jmp);
     BasicBlock* genCallFinally(BasicBlock* block);
 #if defined(TARGET_LOONGARCH64) || defined(TARGET_RISCV64)
-    // TODO: refactor for LA.
     void genCodeForJumpCompare(GenTreeOpCC* tree);
 #endif
 #if defined(TARGET_ARM64)