[StaticAnalyzer] Fix tryExpandAsInteger's failures on PCH macros (#142722) The function `tryExpandAsInteger` attempts to extract an integer from a macro definition. Previously, the attempt would fail when the macro is from a PCH, because the function tried to access the text buffer of the source file, which does not exist in case of PCHs. The fix uses `Preprocessor::getSpelling`, which works in either cases. rdar://151403070 --------- Co-authored-by: Balazs Benics <benicsbalazs@gmail.com>
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