Make irqsave/irqrestore (much) cheaper.

nuttx/arch/arm/include/armv7-m/irq.h

@@ -131,6 +131,8 @@ struct xcptcontext
 
 /* Disable IRQs */
 
+static inline void irqdisable(void) __attribute__((always_inline, no_instrument_function));
+
 static inline void irqdisable(void)
 {
   __asm__ __volatile__ ("\tcpsid  i\n");
@@ -138,6 +140,8 @@ static inline void irqdisable(void)
 
 /* Save the current primask state & disable IRQs */
 
+static inline irqstate_t irqsave(void) __attribute__((always_inline, no_instrument_function));
+
 static inline irqstate_t irqsave(void)
 {
   unsigned short primask;
@@ -158,6 +162,8 @@ static inline irqstate_t irqsave(void)
 
 /* Enable IRQs */
 
+static inline void irqenable(void) __attribute__((always_inline, no_instrument_function));
+
 static inline void irqenable(void)
 {
   __asm__ __volatile__ ("\tcpsie  i\n");
@@ -165,6 +171,8 @@ static inline void irqenable(void)
 
 /* Restore saved primask state */
 
+static inline void irqrestore(irqstate_t primask) __attribute__((always_inline, no_instrument_function));
+
 static inline void irqrestore(irqstate_t primask)
 {
   /* If bit 0 of the primask is 0, then we need to restore