Xi Ge 0390d452a6 libSyntax: parse function argument syntax node. (#12803) ...

This commit teaches parser to parse two libSyntax nodes: FunctionCallArgument and
FunctionCallArgumentList. Along with the change, some libSyntax parsing infrastructure changes
as well: (1) parser doesn't directly insert token into the buffer for libSyntax node creation;
instead, when creating a simple libSyntax node like integer literal expression, parser should indicate the location of the last token in the node; (2) implicit libSyntax nodes like empty
statement list must contain a source location indicating where the implicit nodes should appear
(immediately before the token at the given location).

2017-11-07 15:59:00 -08:00

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