Implement string.match in C++.

src/regexp-macro-assembler-ia32.cc

Index: src/regexp-macro-assembler-ia32.cc
diff --git a/src/regexp-macro-assembler-ia32.cc b/src/regexp-macro-assembler-ia32.cc
index 2a7bf3e76b41442fd863405eebcb0bee6e2fb9c9..02f445edce21b2c16077ed06829a502a0ef19a7a 100644
--- a/src/regexp-macro-assembler-ia32.cc
+++ b/src/regexp-macro-assembler-ia32.cc
@@ -962,6 +962,8 @@ RegExpMacroAssemblerIA32::Result RegExpMacroAssemblerIA32::Match(
     int previous_index) {
 
   ASSERT(subject->IsFlat());
+  ASSERT(previous_index >= 0);
+  ASSERT(previous_index <= subject->length());
 
   // No allocations before calling the regexp, but we can't use
   // AssertNoAllocation, since regexps might be preempted, and another thread