CodeBlock: LLIntCallLinkInfo vector can be sized-to-fit at creation.

CodeBlock: LLIntCallLinkInfo vector can be sized-to-fit at creation.
<https://webkit.org/b/120487>

Reviewed by Oliver Hunt.

CodeBlock::m_llintCallLinkInfos never changes size after creation, so make it a Vector
instead of a SegmentedVector. Use resizeToFit() instead of grow() since we know the
exact amount of space needed.

* bytecode/CodeBlock.h:
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::shrinkToFit):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@154863 268f45cc-cd09-0410-ab3c-d52691b4dbfc