entry: Always inline local_irq_{enable,disable}_exit_to_user()

clang needs __always_inline instead of inline, even for tiny helpers.

This saves some cycles in system call fast path, and saves 195 bytes
on x86_64 build:

$ size vmlinux.before vmlinux.after
text data bss dec hex filename
34652814 22291961 5875180 62819955 3be8e73 vmlinux.before
34652619 22291961 5875180 62819760 3be8db0 vmlinux.after

Signed-off-by: Eric Dumazet <[e-mail]>
Signed-off-by: Peter Zijlstra (Intel) <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

include/linux/irq-entry-common.h

···
 static inline void local_irq_enable_exit_to_user(unsigned long ti_work);
 
 #ifndef local_irq_enable_exit_to_user
-static inline void local_irq_enable_exit_to_user(unsigned long ti_work)
+static __always_inline void local_irq_enable_exit_to_user(unsigned long ti_work)
 {
 	local_irq_enable();
 }
···
 static inline void local_irq_disable_exit_to_user(void);
 
 #ifndef local_irq_disable_exit_to_user
-static inline void local_irq_disable_exit_to_user(void)
+static __always_inline void local_irq_disable_exit_to_user(void)
 {
 	local_irq_disable();
 }