Refactor location tracking.

R=kbr@chromium.org

Review URL: https://codereview.appspot.com/9078046


Conflicts:

	src/compiler/glslang_tab.cpp
	src/compiler/glslang_tab.h

git-svn-id: http://angleproject.googlecode.com/svn/branches/dx11proto@2237 736b8ea6-26fd-11df-bfd4-992fa37f6226
20 files changed