target/mips: Avoid tcg_const_tl in gen_r6_ld

Allocate a separate temp for modification.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
diff --git a/target/mips/tcg/translate.c b/target/mips/tcg/translate.c
index 7018c42..bbc2212 100644
--- a/target/mips/tcg/translate.c
+++ b/target/mips/tcg/translate.c
@@ -2964,8 +2964,8 @@
 static inline void gen_r6_ld(target_long addr, int reg, int memidx,
                              MemOp memop)
 {
-    TCGv t0 = tcg_const_tl(addr);
-    tcg_gen_qemu_ld_tl(t0, t0, memidx, memop);
+    TCGv t0 = tcg_temp_new();
+    tcg_gen_qemu_ld_tl(t0, tcg_constant_tl(addr), memidx, memop);
     gen_store_gpr(t0, reg);
 }