target/arm: Add TBFLAG_M32.SECURE

Remove the use of regime_is_secure from arm_tr_init_disas_context.
Instead, provide the value of v8m_secure directly from tb_flags.
Rather than use regime_is_secure, use the env->v7m.secure directly,
as per arm_mmu_idx_el.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20221001162318.153420-8-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index 68d9956..a085c17 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -3203,6 +3203,8 @@
 FIELD(TBFLAG_M32, FPCCR_S_WRONG, 4, 1)          /* Not cached. */
 /* Set if MVE insns are definitely not predicated by VPR or LTPSIZE */
 FIELD(TBFLAG_M32, MVE_NO_PRED, 5, 1)            /* Not cached. */
+/* Set if in secure mode */
+FIELD(TBFLAG_M32, SECURE, 6, 1)
 
 /*
  * Bit usage when in AArch64 state