target/s390x: Expand TCGv type as 64-bit target

The s390x target is a 64-bit one, so TCGv expands to TCGv_i64.
Use the latter which is already used about a hundred times in
this file, and is also more explicit.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20260206181953.18683-9-philmd@linaro.org>

target/s390x/tcg/translate.c

@@ -3142,7 +3142,7 @@ static DisasJumpType op_mov2(DisasContext *s, DisasOps *o)
 static DisasJumpType op_mov2e(DisasContext *s, DisasOps *o)
 {
     int b2 = get_field(s, b2);
-    TCGv ar1 = tcg_temp_new_i64();
+    TCGv_i64 ar1 = tcg_temp_new_i64();
     int r1 = get_field(s, r1);
 
     o->out = o->in2;
@@ -5743,9 +5743,9 @@ static void in2_a2(DisasContext *s, DisasOps *o)
 }
 #define SPEC_in2_a2 0
 
-static TCGv gen_ri2(DisasContext *s)
+static TCGv_i64 gen_ri2(DisasContext *s)
 {
-    TCGv ri2 = NULL;
+    TCGv_i64 ri2 = NULL;
     bool is_imm;
     int imm;