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

src/mips64/simulator-mips64.cc

Index: src/mips64/simulator-mips64.cc
diff --git a/src/mips64/simulator-mips64.cc b/src/mips64/simulator-mips64.cc
index bb39b97cca82003e9d46adae5f2381b192e0ecf6..95b9fce7fc34a055abf95da695b024a8613847d7 100644
--- a/src/mips64/simulator-mips64.cc
+++ b/src/mips64/simulator-mips64.cc
@@ -2012,7 +2012,7 @@ 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 = ((uint32_t)rt_u >> sa) | ((uint32_t)rt_u << (32 - sa));
+            *alu_out = base::bits::RotateRight32((uint32_t)rt_u, sa);
           }
           break;
         case DSRL:
@@ -2045,8 +2045,7 @@ 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 =
-                ((uint32_t)rt_u >> rs_u) | ((uint32_t)rt_u << (32 - rs_u));
+            *alu_out = base::bits::RotateRight32(((uint32_t)rt_u, rs_u);
           }
           break;
         case DSRLV:
@@ -2058,7 +2057,7 @@ 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: