Disable RegExp tests when using JSCRE backend.

runtime/vm/regexp_test.cc

Index: runtime/vm/regexp_test.cc
diff --git a/runtime/vm/regexp_test.cc b/runtime/vm/regexp_test.cc
index 0b1f3003d1836c01c4d3d298e04f07235af2e84e..4af897491b69dd6d2f8fd9b4b3d56ac8203bff14 100644
--- a/runtime/vm/regexp_test.cc
+++ b/runtime/vm/regexp_test.cc
@@ -11,6 +11,8 @@
 
 namespace dart {
 
+DECLARE_FLAG(bool, use_jscre);
+
 static RawArray* Match(const String& pat, const String& str) {
   Isolate* isolate = Isolate::Current();
   const JSRegExp& regexp = JSRegExp::Handle(
@@ -23,6 +25,9 @@ static RawArray* Match(const String& pat, const String& str) {
 }
 
 TEST_CASE(RegExp_OneByteString) {
+  if (FLAG_use_jscre)
+    return;
+
   uint8_t chars[] = { 'a', 'b', 'c', 'b', 'a' };
   intptr_t len = ARRAY_SIZE(chars);
   const String& str = String::Handle(
@@ -44,6 +49,9 @@ TEST_CASE(RegExp_OneByteString) {
 }
 
 TEST_CASE(RegExp_TwoByteString) {
+  if (FLAG_use_jscre)
+    return;
+
   uint16_t chars[] = { 'a', 'b', 'c', 'b', 'a' };
   intptr_t len = ARRAY_SIZE(chars);
   const String& str = String::Handle(
@@ -65,6 +73,9 @@ TEST_CASE(RegExp_TwoByteString) {
 }
 
 TEST_CASE(RegExp_ExternalOneByteString) {
+  if (FLAG_use_jscre)
+    return;
+
   uint8_t chars[] = { 'a', 'b', 'c', 'b', 'a' };
   intptr_t len = ARRAY_SIZE(chars);
   const String& str = String::Handle(
@@ -86,6 +97,9 @@ TEST_CASE(RegExp_ExternalOneByteString) {
 }
 
 TEST_CASE(RegExp_ExternalTwoByteString) {
+  if (FLAG_use_jscre)
+    return;
+
   uint16_t chars[] = { 'a', 'b', 'c', 'b', 'a' };
   intptr_t len = ARRAY_SIZE(chars);
   const String& str = String::Handle(