MIPS: Use macro-instructions in code-generator.

Port for: https://chromium-review.googlesource.com/c/v8/v8/+/608975

In code generator for MIPS32, certain instructions are substituted with
corresponding macro-instructions.

TEST=
BUG=

Change-Id: I2ac47a785f0ea14c448f727da124dc78ea6c81af
Reviewed-on: https://chromium-review.googlesource.com/699998Reviewed-by: Ivica Bogosavljevic <ivica.bogosavljevic@imgtec.com>
Commit-Queue: Ivica Bogosavljevic <ivica.bogosavljevic@imgtec.com>
Cr-Commit-Position: refs/heads/master@{#48278}

src/mips/macro-assembler-mips.cc

@@ -1861,7 +1861,7 @@ void TurboAssembler::Trunc_uw_s(FPURegister fd, FPURegister fs,
   mtc1(t8, fd);
 }
 
-void MacroAssembler::Trunc_w_d(FPURegister fd, FPURegister fs) {
+void TurboAssembler::Trunc_w_d(FPURegister fd, FPURegister fs) {
   if (IsMipsArchVariant(kLoongson) && fd == fs) {
     Mfhc1(t8, fs);
     trunc_w_d(fd, fs);
@@ -1871,8 +1871,7 @@ void MacroAssembler::Trunc_w_d(FPURegister fd, FPURegister fs) {
   }
 }
 
-
-void MacroAssembler::Round_w_d(FPURegister fd, FPURegister fs) {
+void TurboAssembler::Round_w_d(FPURegister fd, FPURegister fs) {
   if (IsMipsArchVariant(kLoongson) && fd == fs) {
     Mfhc1(t8, fs);
     round_w_d(fd, fs);
@@ -1882,8 +1881,7 @@ void MacroAssembler::Round_w_d(FPURegister fd, FPURegister fs) {
   }
 }
 
-
-void MacroAssembler::Floor_w_d(FPURegister fd, FPURegister fs) {
+void TurboAssembler::Floor_w_d(FPURegister fd, FPURegister fs) {
   if (IsMipsArchVariant(kLoongson) && fd == fs) {
     Mfhc1(t8, fs);
     floor_w_d(fd, fs);
@@ -1893,8 +1891,7 @@ void MacroAssembler::Floor_w_d(FPURegister fd, FPURegister fs) {
   }
 }
 
-
-void MacroAssembler::Ceil_w_d(FPURegister fd, FPURegister fs) {
+void TurboAssembler::Ceil_w_d(FPURegister fd, FPURegister fs) {
   if (IsMipsArchVariant(kLoongson) && fd == fs) {
     Mfhc1(t8, fs);
     ceil_w_d(fd, fs);

src/mips/macro-assembler-mips.h

@@ -609,6 +609,11 @@ class TurboAssembler : public Assembler {
   void Trunc_uw_s(FPURegister fd, FPURegister fs, FPURegister scratch);
   void Trunc_uw_s(FPURegister fd, Register rs, FPURegister scratch);
 
+  void Trunc_w_d(FPURegister fd, FPURegister fs);
+  void Round_w_d(FPURegister fd, FPURegister fs);
+  void Floor_w_d(FPURegister fd, FPURegister fs);
+  void Ceil_w_d(FPURegister fd, FPURegister fs);
+
   // FP32 mode: Move the general purpose register into
   // the high part of the double-register pair.
   // FP64 mode: Move the general-purpose register into
@@ -1057,11 +1062,6 @@ class MacroAssembler : public TurboAssembler {
   void PushSafepointRegisters();
   void PopSafepointRegisters();
 
-  void Trunc_w_d(FPURegister fd, FPURegister fs);
-  void Round_w_d(FPURegister fd, FPURegister fs);
-  void Floor_w_d(FPURegister fd, FPURegister fs);
-  void Ceil_w_d(FPURegister fd, FPURegister fs);
-
   // Truncates a double using a specific rounding mode, and writes the value
   // to the result register.
   // The except_flag will contain any exceptions caused by the instruction.