[parser] Remove inlining of Parser::RewriteSpreads

Despite the V8_INLINE annotation, it was never actually inlined until
18cac20c removed the NonPatternRewriter,
causing all calls to Parser::RewriteNonPattern() to inline RewriteSpreads.

This patch should recover the binary bloat in the attached bug while
retaining the inlining of the rest of RewriteNonPattern, which in
the common case does very little work (and doesn't call out to RewriteSpreads).

Bug: chromium:784924
Change-Id: I1c2062b41ceb51a9522d49bdb9353e1840393ca1
Reviewed-on: https://chromium-review.googlesource.com/769442Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49370}

src/parsing/parser.h

@@ -558,7 +558,7 @@ class V8_EXPORT_PRIVATE Parser : public NON_EXPORTED_BASE(ParserBase<Parser>) {
   V8_INLINE Expression* RewriteAssignExponentiation(Expression* left,
                                                     Expression* right, int pos);
 
-  V8_INLINE Expression* RewriteSpreads(ArrayLiteral* lit);
+  Expression* RewriteSpreads(ArrayLiteral* lit);
 
   // Rewrite expressions that are not used as patterns
   V8_INLINE void RewriteNonPattern(bool* ok);