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Inlining the assignment and copy constructor for a class
like ExplodedFrameState exploded the machine code in stl::vector.

gcc:
Total change: -14969 bytes
==========================
  2 added, totalling +504 bytes across 1 sources
  1 removed, totalling -3387 bytes across 1 sources
  0 added, totalling 0 bytes across 0 sources
  3 shrunk, for a net change of -12086 bytes (14716 bytes before, 2630 bytes after) across 2 sources

It also helps for clang which normally ignores programmers hints to inline anyway:
clang:
Total change: -918 bytes
========================
  1 added, totalling +263 bytes across 1 sources
  3 removed, totalling -1098 bytes across 2 sources
  2 grown, for a net change of +161 bytes (1822 bytes before, 1983 bytes after) across 1 sources
  1 shrunk, for a net change of -244 bytes (1401 bytes before, 1157 bytes after) across 1 sources

BUG=

Review URL: https://codereview.chromium.org/400923002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284424 0039d316-1c4b-4281-b951-d872f2087c98