toolchain: gcc: iar: add ___in_section_unique()

Macros __in_section_unique() and __in_section_unique_named() use
___in_section with  __FILE__ argument to create a unique section name.
Since __FILE__ is a string, calling Z_STRINGIFY(__FILE__) in
___in_section() causes double quotes in __FILE__ value to be masked.
This prevents ld from matching section names output by this script.
For example, when using CONFIG_CODE_DATA_RELOCATION to relocate
a noinit section, __in_section_unique() generates the following
section name:

KEEP(*file.c.obj(.noinit."WEST_TOPDIR/path/file.c".symbol))

Besides, __FILE__ is used to create unique sections in two macros,
so why not unify this approach.

This fix adds ___in_section_unique() macro, which substitutes __FILE__
string into section name without additional stringification. Thus,
resulting section is correctly matched by ld.

Signed-off-by: Nikita Divakov <grommerin@gmail.com>

Author: Grommerin

include/zephyr/toolchain/gcc.h

@@ -200,13 +200,17 @@ do {                                                                    \
 				"." Z_STRINGIFY(c))))
 #define __in_section(a, b, c) ___in_section(a, b, c)
 
+#define ___in_section_unique(a, b) \
+	__attribute__((section("." Z_STRINGIFY(a)		\
+				"." __FILE__			\
+				"." Z_STRINGIFY(b))))
+
 #ifndef __in_section_unique
-#define __in_section_unique(seg) ___in_section(seg, __FILE__, __COUNTER__)
+#define __in_section_unique(seg) ___in_section_unique(seg, __COUNTER__)
 #endif
 
 #ifndef __in_section_unique_named
-#define __in_section_unique_named(seg, name) \
-	___in_section(seg, __FILE__, name)
+#define __in_section_unique_named(seg, name) ___in_section_unique(seg, name)
 #endif
 
 /* When using XIP, using '__ramfunc' places a function into RAM instead

include/zephyr/toolchain/iar/iccarm.h

@@ -121,10 +121,14 @@ do {                                                                    \
 				"." Z_STRINGIFY(c))))
 #define __in_section(a, b, c) ___in_section(a, b, c)
 
-#define __in_section_unique(seg) ___in_section(seg, __FILE__, __COUNTER__)
+#define ___in_section_unique(a, b) \
+	__attribute__((section("." Z_STRINGIFY(a)		\
+				"." __FILE__			\
+				"." Z_STRINGIFY(b))))
 
-#define __in_section_unique_named(seg, name) \
-	___in_section(seg, __FILE__, name)
+#define __in_section_unique(seg) ___in_section_unique(seg, __COUNTER__)
+
+#define __in_section_unique_named(seg, name) ___in_section_unique(seg, name)
 
 /* When using XIP, using '__ramfunc' places a function into RAM instead
  * of FLASH. Make sure '__ramfunc' is defined only when