MIPS: Fixed crashes exposed though fuzzing.

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 a9ad5cf6971bc53c5c7bd174634c440b7aff5903..d3fdbd6b33ad2e3a603d2c91991019d4e3b1d6d9 100644
--- a/src/mips/macro-assembler-mips.h
+++ b/src/mips/macro-assembler-mips.h
@@ -967,6 +967,12 @@ class MacroAssembler: public Assembler {
   // handler chain.
   void ThrowUncatchable(Register value);
 
+  // Throw a message string as an exception.
+  void Throw(BailoutReason reason);
+
+  // Throw a message string as an exception if a condition is not true.
+  void ThrowIf(Condition cc, BailoutReason reason, Register rs, Operand rt);
+
   // Copies a fixed number of fields of heap objects from src to dst.
   void CopyFields(Register dst, Register src, RegList temps, int field_count);
 
@@ -1452,6 +1458,12 @@ class MacroAssembler: public Assembler {
 
   void JumpIfNotUniqueName(Register reg, Label* not_unique_name);
 
+  void EmitSeqStringSetCharCheck(Register string,
+                                 Register index,
+                                 Register value,
+                                 Register scratch,
+                                 uint32_t encoding_mask);
+
   // Test that both first and second are sequential ASCII strings.
   // Assume that they are non-smis.
   void JumpIfNonSmisNotBothSequentialAsciiStrings(Register first,