The LLVM debugging API changed since LLVM 7. Updated the code to work
with the new API.

Also enabled Kokoro builds with REACTOR_EMIT_DEBUG_INFO and
REACTOR_EMIT_PRINT_LOCATION on LLVM 10.

Bug: b/152339534
Change-Id: Ia3af789077842013aad74ac8af5f3e5582801963
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/46730Tested-by: Antonio Maiorano <amaiorano@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Result: kokoro <noreply+kokoro@google.com>