FT32: define macros for instruction recognition.

Other places (e.g. the gdb stack unwinder) can use these instead of
hard-coded patterns.

[include/Changelog]

2015-09-26  James Bowman  <james.bowman@ftdichip.com>

	* opcode/ft32.h: Add instruction macros FT32_*()

include/ChangeLog

@@ -1,3 +1,7 @@
+2015-09-26  James Bowman  <james.bowman@ftdichip.com>
+
+	* opcode/ft32.h: Add instruction macros FT32_*()
+
 2015-09-20  Rich Felker  <dalias@libc.org>
 
 	* bfdlink.h (struct bfd_link_info): Add "nointerp" field.

include/opcode/ft32.h

@@ -96,5 +96,11 @@ typedef struct ft32_opc_info_t
 #define FT32_FLD_AL_BIT 0
 #define FT32_FLD_AL_SIZ 4
 
+#define FT32_IS_CALL(inst)   (((inst) & 0xfffc0000) == 0x00340000)
+#define FT32_IS_PUSH(inst)   (((inst) & 0xfff00000) == 0x84000000)
+#define FT32_PUSH_REG(inst)  (((inst) >> 15) & 0x1f)
+#define FT32_IS_LINK(inst)   (((inst) & 0xffff0000) == 0x95d00000)
+#define FT32_LINK_SIZE(inst) ((inst) & 0xffff)
+
 #define FT32_FLD_R_D_POST (1 << 17)
 #define FT32_FLD_R_1_POST (1 << 18)