Fix layout(index=) parse assert on es 100 shaders Remove invalid assert about layout index qualifier being present only if EXT_blend_func_extended is present. The layout qualifier gets parsed to support EXT_shader_framebuffer_fetch in ES 100 shaders to support "layout(incoherent) mediump vec4 gl_FragData[gl_MaxDrawBuffers]" Fixed: angleproject:8570 Change-Id: I0d0d99bcc882a0befd97c2510dec4a8ccf1690bd Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5340249 Reviewed-by: Kenneth Russell <kbr@chromium.org> Commit-Queue: Kenneth Russell <kbr@chromium.org> Auto-Submit: Kimmo Kinnunen <kkinnunen@apple.com>