MIPS[64]: Fix jump_tables6 test for r6 architectures

src/mips/macro-assembler-mips.h

Index: src/mips/macro-assembler-mips.h
diff --git a/src/mips/macro-assembler-mips.h b/src/mips/macro-assembler-mips.h
index 38115bc6d87fd024665e54d55014bb9f3336fe7a..71bff266ebf05c0f5fa07000ea95c87d184e96ce 100644
--- a/src/mips/macro-assembler-mips.h
+++ b/src/mips/macro-assembler-mips.h
@@ -208,6 +208,12 @@ class MacroAssembler: public Assembler {
               Heap::RootListIndex index,
               BranchDelaySlot bdslot = PROTECT);
 
+// Number of instructions needed for calculation of switch table entry address
+#ifdef _MIPS_ARCH_MIPS32R6
+  static const int kSwitchTablePrologueSize = 5;
+#else
+  static const int kSwitchTablePrologueSize = 10;
+#endif
   // GetLabelFunction must be lambda '[](size_t index) -> Label*' or a
   // functor/function with 'Label *func(size_t index)' declaration.
   template <typename Func>
@@ -1818,13 +1824,13 @@ template <typename Func>
 void MacroAssembler::GenerateSwitchTable(Register index, size_t case_count,
                                          Func GetLabelFunction) {
   if (kArchVariant >= kMips32r6) {
-    BlockTrampolinePoolFor(case_count + 5);
+    BlockTrampolinePoolFor(case_count + kSwitchTablePrologueSize);
     addiupc(at, 5);
     Lsa(at, at, index, kPointerSizeLog2);
     lw(at, MemOperand(at));
   } else {
     Label here;
-    BlockTrampolinePoolFor(case_count + 10);
+    BlockTrampolinePoolFor(case_count + kSwitchTablePrologueSize);
     push(ra);
     bal(&here);
     sll(at, index, kPointerSizeLog2);  // Branch delay slot.