target-arm: Remove unnecessary code now read/write fns can't fail

Now that cpreg read and write functions can't fail and throw an
exception, we can remove the code from the translator that synchronises
the guest PC in case an exception is thrown.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

target-arm/translate-a64.c

diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c
index e70d14f..ef305e3 100644
--- a/target-arm/translate-a64.c
+++ b/target-arm/translate-a64.c
@@ -1231,7 +1231,6 @@
             tcg_gen_movi_i64(tcg_rt, ri->resetvalue);
         } else if (ri->readfn) {
             TCGv_ptr tmpptr;
-            gen_a64_set_pc_im(s->pc - 4);
             tmpptr = tcg_const_ptr(ri);
             gen_helper_get_cp_reg64(tcg_rt, cpu_env, tmpptr);
             tcg_temp_free_ptr(tmpptr);
@@ -1244,7 +1243,6 @@
             return;
         } else if (ri->writefn) {
             TCGv_ptr tmpptr;
-            gen_a64_set_pc_im(s->pc - 4);
             tmpptr = tcg_const_ptr(ri);
             gen_helper_set_cp_reg64(cpu_env, tmpptr, tcg_rt);
             tcg_temp_free_ptr(tmpptr);

target-arm/translate.c

diff --git a/target-arm/translate.c b/target-arm/translate.c
index 0805053..6ccf0ba 100644
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -6876,7 +6876,6 @@
                     tmp64 = tcg_const_i64(ri->resetvalue);
                 } else if (ri->readfn) {
                     TCGv_ptr tmpptr;
-                    gen_set_pc_im(s, s->pc);
                     tmp64 = tcg_temp_new_i64();
                     tmpptr = tcg_const_ptr(ri);
                     gen_helper_get_cp_reg64(tmp64, cpu_env, tmpptr);
@@ -6899,7 +6898,6 @@
                     tmp = tcg_const_i32(ri->resetvalue);
                 } else if (ri->readfn) {
                     TCGv_ptr tmpptr;
-                    gen_set_pc_im(s, s->pc);
                     tmp = tcg_temp_new_i32();
                     tmpptr = tcg_const_ptr(ri);
                     gen_helper_get_cp_reg(tmp, cpu_env, tmpptr);
@@ -6934,7 +6932,6 @@
                 tcg_temp_free_i32(tmphi);
                 if (ri->writefn) {
                     TCGv_ptr tmpptr = tcg_const_ptr(ri);
-                    gen_set_pc_im(s, s->pc);
                     gen_helper_set_cp_reg64(cpu_env, tmpptr, tmp64);
                     tcg_temp_free_ptr(tmpptr);
                 } else {
@@ -6945,7 +6942,6 @@
                 if (ri->writefn) {
                     TCGv_i32 tmp;
                     TCGv_ptr tmpptr;
-                    gen_set_pc_im(s, s->pc);
                     tmp = load_reg(s, rt);
                     tmpptr = tcg_const_ptr(ri);
                     gen_helper_set_cp_reg(cpu_env, tmpptr, tmp);