Merge branch 'feature/add_exec_caps_to_iram_region' into 'master'

feat(heap): Add executable caps to IRAM region

See merge request sdk/ESP8266_RTOS_SDK!1589

Author: donghengqaz

components/heap/include/esp_heap_caps.h

@@ -31,6 +31,7 @@ extern "C" {
  */
 #define HEAP_ALIGN(ptr)	        (((size_t)ptr + (HEAP_ALIGN_SIZE - 1)) & ~(HEAP_ALIGN_SIZE - 1))
 
+#define MALLOC_CAP_EXEC         (1 << 0)    ///< Memory must be able to run executable code
 #define MALLOC_CAP_32BIT	    (1 << 1)    ///< Memory must allow for aligned 32-bit data accesses
 #define MALLOC_CAP_8BIT	        (1 << 2)    ///< Memory must allow for 8-bit data accesses
 #define MALLOC_CAP_DMA		    (1 << 3)    ///< Memory must be able to accessed by DMA

components/heap/port/esp8266/esp_heap_init.c

@@ -46,7 +46,7 @@ void heap_caps_init(void)
     if (iram_size > HEAP_REGION_IRAM_MIN && iram_size < HEAP_REGION_IRAM_MAX) {
         g_heap_region[heap_region_num].start_addr = (uint8_t *)&_iram_end;
         g_heap_region[heap_region_num].total_size = iram_size;
-        g_heap_region[heap_region_num].caps = MALLOC_CAP_32BIT;
+        g_heap_region[heap_region_num].caps = MALLOC_CAP_32BIT | MALLOC_CAP_EXEC;
         heap_region_num++;
     }
 #endif