Compiles and links shaders that perform deep nesting of control blocks and calls.

Bug: b/123587120
Change-Id: I8f19611cbe6d36990ad368a600d2d5be20b1ea07
Reviewed-on: https://swiftshader-review.googlesource.com/c/24728Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>