Fix some more pedantic compiler warnings.

Argument name shadows field name.
Lack of case statements for kMips64.

Change-Id: Ib3ca16f79a4d44ae80ef32f22cc79cbe9527f4f1
diff --git a/runtime/instruction_set.h b/runtime/instruction_set.h
index ae8eeac..de6d0f4 100644
--- a/runtime/instruction_set.h
+++ b/runtime/instruction_set.h
@@ -56,6 +56,7 @@
 static constexpr size_t kArmPointerSize = 4;
 static constexpr size_t kArm64PointerSize = 8;
 static constexpr size_t kMipsPointerSize = 4;
+static constexpr size_t kMips64PointerSize = 8;
 static constexpr size_t kX86PointerSize = 4;
 static constexpr size_t kX86_64PointerSize = 8;
 
@@ -93,6 +94,8 @@
       return kX86_64PointerSize;
     case kMips:
       return kMipsPointerSize;
+    case kMips64:
+      return kMips64PointerSize;
     case kNone:
       LOG(FATAL) << "ISA kNone does not have pointer size.";
       return 0;
@@ -114,6 +117,7 @@
 
     case kArm64:
     case kX86_64:
+    case kMips64:
       return true;
 
     case kNone: