Use Rotate*() functions instead of doing this manually.

src/mips/simulator-mips.cc

Index: src/mips/simulator-mips.cc
diff --git a/src/mips/simulator-mips.cc b/src/mips/simulator-mips.cc
index 79f337d3df05a2e18208b97a94977d2330563f93..7ea38419358a600f8c6202f2f30bcdd5c6e350bb 100644
--- a/src/mips/simulator-mips.cc
+++ b/src/mips/simulator-mips.cc
@@ -1935,7 +1935,7 @@ void Simulator::ConfigureTypeRegister(Instruction* instr,
             // Logical right-rotate of a word by a fixed number of bits. This
             // is special case of SRL instruction, added in MIPS32 Release 2.
             // RS field is equal to 00001.
-            *alu_out = (rt_u >> sa) | (rt_u << (32 - sa));
+            *alu_out = base::bits::RotateRight32(rt_u, sa);
           }
           break;
         case SRA:
@@ -1953,7 +1953,7 @@ void Simulator::ConfigureTypeRegister(Instruction* instr,
             // Logical right-rotate of a word by a variable number of bits.
             // This is special case od SRLV instruction, added in MIPS32
             // Release 2. SA field is equal to 00001.
-            *alu_out = (rt_u >> rs_u) | (rt_u << (32 - rs_u));
+            *alu_out = base::bits::RotateRight32(rt_u, rs_u);
           }
           break;
         case SRAV: