Fix interpreted regexp build wrt tracing.

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

Index: src/regexp/regexp-macro-assembler-tracer.cc
diff --git a/src/regexp/regexp-macro-assembler-tracer.cc b/src/regexp/regexp-macro-assembler-tracer.cc
index ec86526033831807f9e495ace269be7fd27e3652..abdf5772091896081adb2f53984d76527538c91d 100644
--- a/src/regexp/regexp-macro-assembler-tracer.cc
+++ b/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]);
 }