Kill REG_PROFILER_RET_SCRATCH (dotnet#37679)

Author: CarolEidt

src/coreclr/src/jit/lsraarm.cpp

@@ -492,6 +492,8 @@ int LinearScan::BuildNode(GenTree* tree)
 
         case GT_RETURN:
             srcCount = BuildReturn(tree);
+            killMask = getKillSetForReturn();
+            BuildDefsWithKills(tree, 0, RBM_NONE, killMask);
             break;
 
         case GT_RETFILT:

src/coreclr/src/jit/target.h

@@ -1103,7 +1103,9 @@ typedef unsigned char   regNumberSmall;
   // The registers trashed by profiler enter/leave/tailcall hook
   // See vm\arm\asmhelpers.asm for more details.
   #define RBM_PROFILER_ENTER_TRASH     RBM_NONE
-  #define RBM_PROFILER_LEAVE_TRASH     RBM_NONE
+  // While REG_PROFILER_RET_SCRATCH is not trashed by the method, the register allocator must
+  // consider it killed by the return.
+  #define RBM_PROFILER_LEAVE_TRASH     RBM_PROFILER_RET_SCRATCH
   #define RBM_PROFILER_TAILCALL_TRASH  RBM_NONE
 
   // Which register are int and long values returned in ?