Prints each debug instruction as it is defined. Yet another tool in debugging the debugger.

Also rename `PRINT_EACH_PROCESSED_INSTRUCTION` to `PRINT_EACH_EMITTED_INSTRUCTION` as that's really what it meant.

Bug: b/148401179
Change-Id: I9ddf90eab1919deefb5f4557756364478f06375a
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/48430Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>