[ARM] Add "avoidmuls" to STAR-MC1 also (llvm#123706)

PR llvm#112540 as the reference.

Author: AlbertHuang-CPU

llvm/lib/Target/ARM/ARMProcessors.td

@@ -377,6 +377,7 @@ def : ProcessorModel<"star-mc1", CortexM4Model,         [ARMv8mMainline,
                                                          FeatureHasSlowFPVFMx,
                                                          FeatureUseMISched,
                                                          FeatureHasNoBranchPredictor,
+                                                         FeatureAvoidMULS,
                                                          FeatureFixCMSE_CVE_2021_35465]>;
 
 def : ProcessorModel<"cortex-m35p", CortexM4Model,      [ARMv8mMainline,

llvm/test/CodeGen/Thumb2/avoidmuls.mir

@@ -1,4 +1,5 @@
 # RUN: llc -mtriple=thumbv7m-none-eabi -mcpu=cortex-m33 -run-pass=thumb2-reduce-size %s -o - | FileCheck %s --check-prefix=MUL
+# RUN: llc -mtriple=thumbv7m-none-eabi -mcpu=star-mc1 -run-pass=thumb2-reduce-size %s -o - | FileCheck %s --check-prefix=MUL
 # RUN: llc -mtriple=thumbv7m-none-eabi --run-pass=thumb2-reduce-size %s -o - | FileCheck %s --check-prefix=MULS
 
 ---
@@ -17,4 +18,4 @@ body:             |
 
 # MULS-LABEL: test
 # MULS: tMUL
-# MULS-NOT: t2MUL
+# MULS-NOT: t2MUL