Fix interpreted regexp build wrt tracing.

R=jgruber@chromium.org

Review-Url: https://codereview.chromium.org/2418123002
Cr-Commit-Position: refs/heads/master@{#40312}

src/regexp/regexp-macro-assembler-tracer.cc

@@ -12,9 +12,9 @@ namespace internal {
 RegExpMacroAssemblerTracer::RegExpMacroAssemblerTracer(
     Isolate* isolate, RegExpMacroAssembler* assembler)
     : RegExpMacroAssembler(isolate, assembler->zone()), assembler_(assembler) {
-  unsigned int type = assembler->Implementation();
-  DCHECK(type < 8);
-  const char* impl_names[] = {"IA32", "ARM", "ARM64", "MIPS",
+  IrregexpImplementation type = assembler->Implementation();
+  DCHECK_LT(type, 9);
+  const char* impl_names[] = {"IA32", "ARM", "ARM64", "MIPS",    "S390",
                               "PPC",  "X64", "X87",   "Bytecode"};
   PrintF("RegExpMacroAssembler%s();\n", impl_names[type]);
 }