Fix build break on osx/arm64 Debug (#102631)

* fix build break on osx/arm64 Debug

* remove constexpr

* Revert "remove constexpr"

This reverts commit e67ca1a.

* Revert "fix build break on osx/arm64 Debug"

This reverts commit dc5ad92.

* remove static constexpr

---------

Co-authored-by: Kunal Pathak <kunalpathak@kunals-mbp.lan>

src/coreclr/jit/regset.h

@@ -74,13 +74,8 @@ class RegSet
     bool rsModifiedRegsMaskInitialized; // Has rsModifiedRegsMask been initialized? Guards against illegal use.
 #endif                                  // DEBUG
 
-#ifdef SWIFT_SUPPORT
-    regMaskTP rsAllCalleeSavedMask;
-    regMaskTP rsIntCalleeSavedMask;
-#else  // !SWIFT_SUPPORT
-    static constexpr regMaskTP rsAllCalleeSavedMask = RBM_CALLEE_SAVED;
-    static constexpr regMaskTP rsIntCalleeSavedMask = RBM_INT_CALLEE_SAVED;
-#endif // !SWIFT_SUPPORT
+    regMaskTP rsAllCalleeSavedMask = RBM_CALLEE_SAVED;
+    regMaskTP rsIntCalleeSavedMask = RBM_INT_CALLEE_SAVED;
 
 public:
     regMaskTP rsGetModifiedRegsMask() const