8311074: RISC-V: Fix -Wconversion warnings in some code header files

Reviewed-by: fyang, coleenp

src/hotspot/cpu/riscv/continuationFreezeThaw_riscv.inline.hpp

@@ -219,7 +219,7 @@ template<typename FKind> frame ThawBase::new_stack_frame(const frame& hf, frame&
     intptr_t* heap_sp = hf.unextended_sp();
     // If caller is interpreted it already made room for the callee arguments
     int overlap = caller.is_interpreted_frame() ? ContinuationHelper::InterpretedFrame::stack_argsize(hf) : 0;
-    const int fsize = ContinuationHelper::InterpretedFrame::frame_bottom(hf) - hf.unextended_sp() - overlap;
+    const int fsize = (int)(ContinuationHelper::InterpretedFrame::frame_bottom(hf) - hf.unextended_sp() - overlap);
     const int locals = hf.interpreter_frame_method()->max_locals();
     intptr_t* frame_sp = caller.unextended_sp() - fsize;
     intptr_t* fp = frame_sp + (hf.fp() - heap_sp);

src/hotspot/cpu/riscv/frame_riscv.inline.hpp

@@ -226,7 +226,7 @@ inline intptr_t* frame::real_fp() const {
 
 inline int frame::frame_size() const {
   return is_interpreted_frame()
-    ? sender_sp() - sp()
+    ? pointer_delta_as_int(sender_sp(), sp())
     : cb()->frame_size();
 }
 

src/hotspot/cpu/riscv/stackChunkFrameStream_riscv.inline.hpp

@@ -114,8 +114,8 @@ inline int StackChunkFrameStream<frame_kind>::interpreter_frame_num_oops() const
   f.interpreted_frame_oop_map(&mask);
   return mask.num_oops()
         + 1 // for the mirror oop
-        + ((intptr_t*)f.interpreter_frame_monitor_begin()
-            - (intptr_t*)f.interpreter_frame_monitor_end()) / BasicObjectLock::size();
+        + pointer_delta_as_int((intptr_t*)f.interpreter_frame_monitor_begin(),
+              (intptr_t*)f.interpreter_frame_monitor_end()) / BasicObjectLock::size();
 }
 
 template<>