MIPS64: Replace JR/JALR with JIC/JIALC for r6.

src/mips64/assembler-mips64.h

Index: src/mips64/assembler-mips64.h
diff --git a/src/mips64/assembler-mips64.h b/src/mips64/assembler-mips64.h
index 0174fa44f91b33483d0125ce096edd45dda9dcf5..de09366b427865870ab2eed1860cc6a3f7f14501 100644
--- a/src/mips64/assembler-mips64.h
+++ b/src/mips64/assembler-mips64.h
@@ -535,7 +535,11 @@ class Assembler : public AssemblerBase {
 
   // Distance between the instruction referring to the address of the call
   // target and the return address.
+#ifdef _MIPS_ARCH_MIPS64R6
+  static const int kCallTargetAddressOffset = 5 * kInstrSize;
+#else
   static const int kCallTargetAddressOffset = 6 * kInstrSize;
+#endif
 
   // Distance between start of patched debug break slot and the emitted address
   // to jump to.
@@ -545,7 +549,11 @@ class Assembler : public AssemblerBase {
   // register.
   static const int kPcLoadDelta = 4;
 
+#ifdef _MIPS_ARCH_MIPS64R6
+  static const int kDebugBreakSlotInstructions = 5;
+#else
   static const int kDebugBreakSlotInstructions = 6;
+#endif
   static const int kDebugBreakSlotLength =
       kDebugBreakSlotInstructions * kInstrSize;