On the Android platform prefer using the ASM code to retrieve TLS context object even for single threaded apps. This helps get rid of a branch in GetGlobalContext() and GetValidGlobalContext() further improving the CPU perf of TLS operations. Bug: angleproject:4717 Change-Id: I58d3d3b7061d613b24f945c07bed497c7c4be25c Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2250318 Commit-Queue: Mohan Maiya <m.maiya@samsung.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>
