Added more missing files required to build with 'is_debug=true' when
LLVM 10 is used as the backend.

Bug: chromium:1108382
Bug: angleproject:4861
Change-Id: I24f5686b96d04508934a59dcc3dd14b799fbd93a
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/46928Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Tested-by: Antonio Maiorano <amaiorano@google.com>