MIPS:[turbofan] Use Ins, Dins to clear bits instead of And with inverted immediate.

src/mips64/assembler-mips64.cc

Index: src/mips64/assembler-mips64.cc
diff --git a/src/mips64/assembler-mips64.cc b/src/mips64/assembler-mips64.cc
index 69bd299ddc313e7eb8704a234b89eaa3030961f6..4c8465a1f8e3da46ea3e19cf4ebfeb20e9c533a9 100644
--- a/src/mips64/assembler-mips64.cc
+++ b/src/mips64/assembler-mips64.cc
@@ -2312,6 +2312,14 @@ void Assembler::ins_(Register rt, Register rs, uint16_t pos, uint16_t size) {
 }
 
 
+void Assembler::dins_(Register rt, Register rs, uint16_t pos, uint16_t size) {
+  // Should be called via MacroAssembler::Dins.
+  // Dext instr has 'rt' field as dest, and two uint5: msb, lsb.
+  DCHECK(kArchVariant == kMips64r2 || kArchVariant == kMips64r6);
+  GenInstrRegister(SPECIAL3, rs, rt, pos + size - 1, pos, DINS);
+}
+
+
 void Assembler::ext_(Register rt, Register rs, uint16_t pos, uint16_t size) {
   // Should be called via MacroAssembler::Ext.
   // Ext instr has 'rt' field as dest, and two uint5: msb, lsb.
@@ -2321,7 +2329,7 @@ void Assembler::ext_(Register rt, Register rs, uint16_t pos, uint16_t size) {
 
 
 void Assembler::dext_(Register rt, Register rs, uint16_t pos, uint16_t size) {
-  // Should be called via MacroAssembler::Ext.
+  // Should be called via MacroAssembler::Dext.
   // Dext instr has 'rt' field as dest, and two uint5: msb, lsb.
   DCHECK(kArchVariant == kMips64r2 || kArchVariant == kMips64r6);
   GenInstrRegister(SPECIAL3, rs, rt, size - 1, pos, DEXT);