[regexp] Port RegExpExecStub to CSA (mostly)

src/bailout-reason.h

Index: src/bailout-reason.h
diff --git a/src/bailout-reason.h b/src/bailout-reason.h
index b5e39c69f75712fb6c7241973ce04fb1dbc55427..bca5a0c3fabcfcdefb143c132ddee39542c2a796 100644
--- a/src/bailout-reason.h
+++ b/src/bailout-reason.h
@@ -237,8 +237,7 @@ namespace internal {
   V(kUnexpectedStackDepth, "Unexpected operand stack depth in full-codegen")   \
   V(kUnexpectedStackPointer, "The stack pointer is not the expected value")    \
   V(kUnexpectedStringType, "Unexpected string type")                           \
-  V(kUnexpectedTypeForRegExpDataFixedArrayExpected,                            \
-    "Unexpected type for RegExp data, FixedArray expected")                    \
+  V(kUnexpectedRegExpExecCall, "Unexpected call to the RegExpExecStub")        \
   V(kUnexpectedValue, "Unexpected value")                                      \
   V(kUnsupportedDoubleImmediate, "Unsupported double immediate")               \
   V(kUnsupportedLetCompoundAssignment, "Unsupported let compound assignment")  \