[clang] fix out of bounds access in an empty string when lexing a _Pr… #3887
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…agma with missing string token The lexer can attempt to lex a _Pragma and crash with an out of bounds string access when it's lexing a _Pragma whose string token is an invalid buffer, e.g. when a module header file from which the macro expansion for that token was deleted from the file system. Differential Revision: https://reviews.llvm.org/D116052 (cherry picked from commit 979d0ee)
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…agma with missing string token
The lexer can attempt to lex a _Pragma and crash with an out of bounds string access when it's
lexing a _Pragma whose string token is an invalid buffer, e.g. when a module header file from which the macro
expansion for that token was deleted from the file system.
Differential Revision: https://reviews.llvm.org/D116052
(cherry picked from commit 979d0ee)