core/video_core: Make NumIds functions constexpr

src/core/hw/gpu.h

@@ -263,7 +263,7 @@ struct Regs {
 
     INSERT_PADDING_WORDS(0x9c3);
 
-    static inline size_t NumIds() {
+    static constexpr size_t NumIds() {
         return sizeof(Regs) / sizeof(u32);
     }
 

src/core/hw/lcd.h

@@ -38,7 +38,7 @@ struct Regs {
     u32 backlight_bottom;
     INSERT_PADDING_WORDS(0x16F);
 
-    static inline size_t NumIds() {
+    static constexpr size_t NumIds() {
         return sizeof(Regs) / sizeof(u32);
     }
 

src/video_core/pica.h

@@ -1221,7 +1221,7 @@ struct Regs {
     // Used for debugging purposes, so performance is not an issue here
     static std::string GetCommandName(int index);
 
-    static inline size_t NumIds() {
+    static constexpr size_t NumIds() {
         return sizeof(Regs) / sizeof(u32);
     }