rs6000: Rename isa attribute "fut" to "p10"

	== The actual changelog had
	==	Backport from trunk
	==	2020-06-29  Segher Boessenkool  <segher@kernel.crashing.org>
	== but the commit scripts refuse that

2020-06-30  Segher Boessenkool  <segher@kernel.crashing.org>

	* config/rs6000/rs6000.md (isa): Rename "fut" to "p10".

gcc/config/rs6000/rs6000.md

@@ -317,7 +317,7 @@
   (const (symbol_ref "(enum attr_cpu) rs6000_tune")))
 
 ;; The ISA we implement.
-(define_attr "isa" "any,p5,p6,p7,p7v,p8v,p9v,p9kf,p9tf,fut"
+(define_attr "isa" "any,p5,p6,p7,p7v,p8v,p9v,p9kf,p9tf,p10"
   (const_string "any"))
 
 ;; Is this alternative enabled for the current CPU/ISA/etc.?
@@ -358,7 +358,7 @@
 	  (match_test "FLOAT128_VECTOR_P (TFmode)"))
      (const_int 1)
 
-     (and (eq_attr "isa" "fut")
+     (and (eq_attr "isa" "p10")
 	  (match_test "TARGET_POWER10"))
      (const_int 1)
     ] (const_int 0)))
@@ -1772,7 +1772,7 @@
    addis %0,%1,%v2
    addi %0,%1,%2"
   [(set_attr "type" "add")
-   (set_attr "isa" "*,*,*,fut")])
+   (set_attr "isa" "*,*,*,p10")])
 
 (define_insn "*addsi3_high"
   [(set (match_operand:SI 0 "gpc_reg_operand" "=b")
@@ -6969,7 +6969,7 @@
 	  "*,          *,
 	   *,          p8v,        p8v,
 	   *,          p8v,        p8v,
-	   *,          *,          fut,        *,
+	   *,          *,          p10,        *,
 	   p8v,        p9v,        p9v,        p8v,
 	   p9v,        p8v,        p9v,
 	   p8v,        p8v,
@@ -8909,7 +8909,7 @@
 	   *,          *")
    (set_attr "isa"
 	  "*,          *,          *,
-	   *,          *,          fut,        *,
+	   *,          *,          p10,        *,
 	   *,          *,          *,
 	   p9v,        p7v,        p9v,        p7v,        *,
 	   p9v,        p9v,        p7v,        *,          *,