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A SourceSpan contains up to two SourceLocations: the location of the
span in the parsed source file (called in_merged), and the location of
the span in an original source file as per a path comment in the parsed
source file (called in_source). In places where only one location can
be reported, the in_source location is preferred but is not guaranteed
to exist, so the in_merged location is used as a fallback.
Because this pattern is used in multiple places, it was added as a
method to SourceSpan and all occurrences of the pattern were replaced
with a method call.
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Previously only the path to the source file was being written, not the
location of the symbol within the file.
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This is an almost complete rewrite of the entire assembler from the
ground up, with a different parsing strategy and a whole new symbol
resolution mechanism for automatically including library files.
The assembly syntax has also been slightly modified, with padding
tokens now being prefixed with '#' instead of '$', and a block-style
anonymous-label syntax which uses the '{' and '}' characters.
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