Remove 3-byte characters causing clang-tblgen to get I/O error.

[SystemZ} This revision fixes the following error caused by 301eb6b6.
LLVM ERROR: IO failure on output stream: EDC5122I Input/output error.

The characters seems to be 3-byte characters which cause the failure with auto conversion from EBCDIC to ASCII.
Credit to @Kai who found this issue.

Reviewed By: abhina.sreeskantharajan

Differential Revision: https://reviews.llvm.org/D152016