ASTC: LDR support doesn't imply HDR support There are SwiftShader related failures related to enabling the textureCompressionASTCHDRKHR feature without properly checking if the VK_EXT_texture_compression_astc_hdr extension is available, so HDR support shouldn't be enabled only based on the LDR support being enabled. Bug: angleproject:4447 Change-Id: Icde34892c9e2efff4b71e8c4e960c2fcff786700 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2080594 Commit-Queue: Alexis Hétu <sugoi@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>