MIPS: convert compile-time checkable DCHECKs to STATIC_ASSERTs.

Port cc6c373e

BUG=

Review URL: https://codereview.chromium.org/867093003

Cr-Commit-Position: refs/heads/master@{#26248}

src/mips/code-stubs-mips.cc

@@ -3954,7 +3954,7 @@ void NameDictionaryLookupStub::GenerateNegativeLookup(MacroAssembler* masm,
         Smi::FromInt(name->Hash() + NameDictionary::GetProbeOffset(i))));
 
     // Scale the index by multiplying by the entry size.
-    DCHECK(NameDictionary::kEntrySize == 3);
+    STATIC_ASSERT(NameDictionary::kEntrySize == 3);
     __ sll(at, index, 1);
     __ Addu(index, index, at);
 

src/mips64/code-stubs-mips64.cc

@@ -3993,7 +3993,7 @@ void NameDictionaryLookupStub::GenerateNegativeLookup(MacroAssembler* masm,
            Operand(name->Hash() + NameDictionary::GetProbeOffset(i)));
 
     // Scale the index by multiplying by the entry size.
-    DCHECK(NameDictionary::kEntrySize == 3);
+    STATIC_ASSERT(NameDictionary::kEntrySize == 3);
     __ dsll(at, index, 1);
     __ Daddu(index, index, at);  // index *= 3.