Disable optimizations for shaders with conditional discard in D3D9, and only use expanded short-circuiting conditionals for expressions with potential side-effects. Conservatively assume aggreate and selection operators have side effects for now. BUG= ANGLEBUG=486 R=geofflang@chromium.org, kbr@chromium.org, nicolas@transgaming.com, shannonwoods@chromium.org Review URL: https://codereview.appspot.com/14441075 Conflicts: src/common/version.h src/compiler/translator.vcxproj src/compiler/translator.vcxproj.filters src/compiler/translator/OutputHLSL.cpp src/libGLESv2/ProgramBinary.cpp src/libGLESv2/Shader.cpp src/libGLESv2/Shader.h Change-Id: Iaf9f10b5de7b33c927ef032f3c4fe9d5095f64dd