This fixes one deadlock in Android's use of SwiftShader.

Bug: b/124530765
Test: atest CtsGraphicsTestCases:android.graphics.cts.BitmapTest#testDrawingHardwareBitmapNotLeaking -- --abi x86
Signed-off-by: Cody Schuffelen <schuffelen@google.com>
Change-Id: I0a8a2674c94ae4fb8b3edb1a2b070b8b3568f8f2
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/27408
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>