libcpp: Merge fixes from upstream
GCC preprocessor/29966:
* macro.c (lex_expansion_token): Save and restore cpp_reader's
cur_token.
(_cpp_create_definition): Don't restore cur_token here.
* lex.c (_cpp_lex_token): Added assertion.
GCC preprocessor/28709:
* macro.c (paste_tokens): Remove PASTE_LEFT from the old lhs.
GCC c/31924
* expr.c (interpret_float_suffix): Check for invalid suffix.
GCC preprocessor/14331
* lex.c (_cpp_get_fresh_line): Don't warn if no newline at EOF.
Fixup whitespacing
Obtained from: gcc per-4.3 (rev. 121340, 124356, 124358, 124730,
125212, 125255 ; GPLv2)
MFC after: 3 weeks
UnifiedSplitRaw
