x86: Move TARGET_SMALL_REGISTER_CLASSES_FOR_MODE_P to i386.cc

Move the TARGET_SMALL_REGISTER_CLASSES_FOR_MODE_P target hook from
i386.h to i386.cc.

	* config/i386/i386.h (TARGET_SMALL_REGISTER_CLASSES_FOR_MODE_P):
	Moved to ...
	* config/i386/i386.cc (TARGET_SMALL_REGISTER_CLASSES_FOR_MODE_P):
	Here.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>

gcc/config/i386/i386.cc

@@ -27084,6 +27084,12 @@ ix86_libgcc_floating_mode_supported_p
 #define TARGET_PREFERRED_RELOAD_CLASS ix86_preferred_reload_class
 #undef TARGET_PREFERRED_OUTPUT_RELOAD_CLASS
 #define TARGET_PREFERRED_OUTPUT_RELOAD_CLASS ix86_preferred_output_reload_class
+/* When this hook returns true for MODE, the compiler allows
+   registers explicitly used in the rtl to be used as spill registers
+   but prevents the compiler from extending the lifetime of these
+   registers.  */
+#undef TARGET_SMALL_REGISTER_CLASSES_FOR_MODE_P
+#define TARGET_SMALL_REGISTER_CLASSES_FOR_MODE_P hook_bool_mode_true
 #undef TARGET_CLASS_LIKELY_SPILLED_P
 #define TARGET_CLASS_LIKELY_SPILLED_P ix86_class_likely_spilled_p
 #undef TARGET_IRA_CALLEE_SAVED_REGISTER_COST_SCALE

gcc/config/i386/i386.h

@@ -1467,12 +1467,6 @@ enum reg_class
 
 #define REGNO_REG_CLASS(REGNO) (regclass_map[(REGNO)])
 
-/* When this hook returns true for MODE, the compiler allows
-   registers explicitly used in the rtl to be used as spill registers
-   but prevents the compiler from extending the lifetime of these
-   registers.  */
-#define TARGET_SMALL_REGISTER_CLASSES_FOR_MODE_P hook_bool_mode_true
-
 #define QI_REG_P(X) (REG_P (X) && QI_REGNO_P (REGNO (X)))
 #define QI_REGNO_P(N) IN_RANGE ((N), FIRST_QI_REG, LAST_QI_REG)