MIPS[64]: Implement insert.df and I8 instructions in simulator

src/mips/constants-mips.h

Index: src/mips/constants-mips.h
diff --git a/src/mips/constants-mips.h b/src/mips/constants-mips.h
index b74280f23576565a35438f32626fd0d27cc23383..6a62787ef47ffd1269fa8c3a8c50a1503bffe1ad 100644
--- a/src/mips/constants-mips.h
+++ b/src/mips/constants-mips.h
@@ -161,6 +161,11 @@ const int kInvalidMSARegister = -1;
 const int kInvalidMSAControlRegister = -1;
 const int kMSAIRRegister = 0;
 const int kMSACSRRegister = 1;
+const int kMSARegSize = 128;
+const int kMSALanesByte = kMSARegSize / 8;
+const int kMSALanesHalf = kMSARegSize / 16;
+const int kMSALanesWord = kMSARegSize / 32;
+const int kMSALanesDword = kMSARegSize / 64;
 
 // FPU (coprocessor 1) control registers. Currently only FCSR is implemented.
 const int kFCSRRegister = 31;