bootstrap:ncc0: use ccache if available in PATH
lib/n/builtins: String.Substring and Stringbuf.Substring
lib/n/builtins: String.Cut_at
bootstrap:lir: remove step_add_sequence_points nonsense

At least, it's useless for now.
bootstrap:lir: remove unused node_jump.to field
bootstrap:autointf: enum: generate COUNT
lib/n/builtins: rename Mask to Enumset
bootstrap: remove references to delegate
bootstrap:passzero: centralize TOP_IS_EXPORT marking
merge COUNT
bootstrap:cprinter: escape_string: add support for not fully escaped input strings
bootstrap:inference: simplify _Ncodeloc quote_code()

Simply go until the next line.
lib/n/builtins: `String: First and Last
lib/n/time: Sysclock: fix zero on Init
bootstrap:inference: wildcard op: fix detection of invalid use of '$'
lib/n/builtins: String.Index: continue performance experiments and improvements

For small needles, there is no question the naive, brute-force approach
is much faster. We believe, without proof, that this is by far the
common case for typical programs.
Makefile: run with -j4 by default
Makefile: remove incorrect use of function
Makefile: ensure CC is always defined to something sensible