Detect incorrect FileCheck variable CLI definition
While the backend code of FileCheck relies on definition of variable
from the command-line to have an equal sign '=' and a variable name
before that, the frontend does not actually enforce it. This leads to
FileCheck crashing when invoked with invalid syntax for the -D option.
This patch adds the missing validation in the frontend. It also makes
the -D option an AlwaysPrefix option to be able to detect -D=FOO as
being a define without variable and -D as missing its value.
- Linaro (changes in version 2 of revision D55940)
- GraphCore (changes in later versions)
Subscribers: JonChesterfield, hiraditya, kristina, probinson,
Differential Revision: https://reviews.llvm.org/D55940